diff --git a/src/widgets/space-focus-hud/ui/GoalCompleteSheet.tsx b/src/widgets/space-focus-hud/ui/GoalCompleteSheet.tsx
new file mode 100644
index 0000000..3b1edfc
--- /dev/null
+++ b/src/widgets/space-focus-hud/ui/GoalCompleteSheet.tsx
@@ -0,0 +1,126 @@
+'use client';
+
+import { useEffect, useMemo, useRef, useState } from 'react';
+import { cn } from '@/shared/lib/cn';
+
+interface GoalCompleteSheetProps {
+  open: boolean;
+  currentGoal: string;
+  onConfirm: (nextGoal: string) => void;
+  onRest: () => void;
+  onClose: () => void;
+}
+
+const GOAL_SUGGESTIONS = [
+  '리뷰 코멘트 2개 처리',
+  '문서 1문단 다듬기',
+  '이슈 1개 정리',
+  '메일 2개 회신',
+];
+
+export const GoalCompleteSheet = ({
+  open,
+  currentGoal,
+  onConfirm,
+  onRest,
+  onClose,
+}: GoalCompleteSheetProps) => {
+  const inputRef = useRef<HTMLInputElement | null>(null);
+  const [draft, setDraft] = useState('');
+
+  useEffect(() => {
+    if (!open) {
+      setDraft('');
+      return;
+    }
+
+    const rafId = window.requestAnimationFrame(() => {
+      inputRef.current?.focus();
+    });
+
+    return () => {
+      window.cancelAnimationFrame(rafId);
+    };
+  }, [open]);
+
+  const placeholder = useMemo(() => {
+    const trimmed = currentGoal.trim();
+
+    if (!trimmed) {
+      return '다음 한 조각을 적어보세요';
+    }
+
+    return `예: ${trimmed}`;
+  }, [currentGoal]);
+
+  const canConfirm = draft.trim().length > 0;
+
+  return (
+    <div
+      className={cn(
+        'pointer-events-none fixed inset-x-0 z-20 flex justify-center px-4 transition-all duration-[260ms] ease-out motion-reduce:duration-0',
+        open ? 'translate-y-0 opacity-100' : 'translate-y-3 opacity-0',
+      )}
+      style={{ bottom: 'calc(env(safe-area-inset-bottom, 0px) + 4.9rem)' }}
+      aria-hidden={!open}
+    >
+      <section className="pointer-events-auto w-[min(460px,94vw)] rounded-2xl border border-white/12 bg-black/26 px-3.5 py-3 text-white shadow-[0_14px_30px_rgba(2,6,23,0.28)] backdrop-blur-md">
+        <header className="flex items-start justify-between gap-2">
+          <div>
+            <h3 className="text-sm font-semibold text-white/92">좋아요. 다음 한 조각은?</h3>
+            <p className="mt-0.5 text-[11px] text-white/58">너무 크게 잡지 말고, 바로 다음 한 조각만.</p>
+          </div>
+          <button
+            type="button"
+            onClick={onClose}
+            className="inline-flex h-6 w-6 items-center justify-center rounded-full border border-white/16 bg-white/[0.05] text-[11px] text-white/72 transition-colors hover:bg-white/[0.12]"
+            aria-label="닫기"
+          >
+            ✕
+          </button>
+        </header>
+
+        <div className="mt-2.5 space-y-2.5">
+          <input
+            ref={inputRef}
+            value={draft}
+            onChange={(event) => setDraft(event.target.value)}
+            placeholder={placeholder}
+            className="h-9 w-full rounded-xl border border-white/14 bg-white/[0.04] px-3 text-sm text-white placeholder:text-white/40 focus:border-sky-200/42 focus:outline-none"
+          />
+
+          <div className="flex flex-wrap gap-1.5">
+            {GOAL_SUGGESTIONS.map((suggestion) => (
+              <button
+                key={suggestion}
+                type="button"
+                onClick={() => setDraft(suggestion)}
+                className="rounded-full border border-white/16 bg-white/[0.04] px-2.5 py-1 text-[11px] text-white/76 transition-colors hover:bg-white/[0.1]"
+              >
+                {suggestion}
+              </button>
+            ))}
+          </div>
+        </div>
+
+        <footer className="mt-3 flex items-center justify-end gap-2">
+          <button
+            type="button"
+            onClick={onRest}
+            className="rounded-full border border-white/18 bg-white/[0.05] px-3 py-1.5 text-xs text-white/74 transition-colors hover:bg-white/[0.11]"
+          >
+            잠깐 쉬기
+          </button>
+          <button
+            type="button"
+            disabled={!canConfirm}
+            onClick={() => onConfirm(draft.trim())}
+            className="rounded-full border border-sky-200/42 bg-sky-300/84 px-3.5 py-1.5 text-xs font-semibold text-slate-900 transition-colors hover:bg-sky-300 disabled:cursor-not-allowed disabled:border-white/16 disabled:bg-white/[0.08] disabled:text-white/48"
+          >
+            바로 다음 조각 시작
+          </button>
+        </footer>
+      </section>
+    </div>
+  );
+};
diff --git a/src/widgets/space-focus-hud/ui/SpaceFocusHudWidget.tsx b/src/widgets/space-focus-hud/ui/SpaceFocusHudWidget.tsx
index 0ea056c..9626c71 100644
--- a/src/widgets/space-focus-hud/ui/SpaceFocusHudWidget.tsx
+++ b/src/widgets/space-focus-hud/ui/SpaceFocusHudWidget.tsx
@@ -1,23 +1,32 @@
 import { useCallback, useEffect, useRef, useState } from 'react';
 import { useReducedMotion } from '@/shared/lib/useReducedMotion';
+import { cn } from '@/shared/lib/cn';
+import { useToast } from '@/shared/ui';
 import { SpaceTimerHudWidget } from '@/widgets/space-timer-hud';
+import { GoalCompleteSheet } from './GoalCompleteSheet';
 import { GoalFlashOverlay } from './GoalFlashOverlay';
 
 interface SpaceFocusHudWidgetProps {
   goal: string;
   timerLabel: string;
   visible: boolean;
+  onGoalUpdate: (nextGoal: string) => void;
 }
 
 export const SpaceFocusHudWidget = ({
   goal,
   timerLabel,
   visible,
+  onGoalUpdate,
 }: SpaceFocusHudWidgetProps) => {
+  const { pushToast } = useToast();
   const reducedMotion = useReducedMotion();
   const [flashVisible, setFlashVisible] = useState(false);
+  const [sheetOpen, setSheetOpen] = useState(false);
+  const [completePulseVisible, setCompletePulseVisible] = useState(false);
   const playbackStateRef = useRef<'running' | 'paused'>('running');
   const flashTimerRef = useRef<number | null>(null);
+  const completePulseTimerRef = useRef<number | null>(null);
 
   const triggerFlash = useCallback((durationMs: number) => {
     if (reducedMotion || !visible) {
@@ -42,6 +51,10 @@ export const SpaceFocusHudWidget = ({
         window.clearTimeout(flashTimerRef.current);
         flashTimerRef.current = null;
       }
+      if (completePulseTimerRef.current) {
+        window.clearTimeout(completePulseTimerRef.current);
+        completePulseTimerRef.current = null;
+      }
     };
   }, []);
 
@@ -55,13 +68,15 @@ export const SpaceFocusHudWidget = ({
   }, [visible, reducedMotion, triggerFlash]);
 
   useEffect(() => {
-    if (!visible || reducedMotion) {
+    const ENABLE_PERIODIC_FLASH = false;
+
+    if (!visible || reducedMotion || !ENABLE_PERIODIC_FLASH) {
       return;
     }
 
     const intervalId = window.setInterval(() => {
       triggerFlash(800);
-    }, 5 * 60 * 1000);
+    }, 10 * 60 * 1000);
 
     return () => {
       window.clearInterval(intervalId);
@@ -72,14 +87,41 @@ export const SpaceFocusHudWidget = ({
     return null;
   }
 
+  const handleOpenCompleteSheet = () => {
+    setCompletePulseVisible(true);
+
+    if (completePulseTimerRef.current) {
+      window.clearTimeout(completePulseTimerRef.current);
+    }
+
+    completePulseTimerRef.current = window.setTimeout(() => {
+      setCompletePulseVisible(false);
+      setSheetOpen(true);
+      completePulseTimerRef.current = null;
+    }, 700);
+  };
+
   return (
     <>
       <GoalFlashOverlay goal={goal} visible={flashVisible} />
+      <div
+        className={cn(
+          'pointer-events-none fixed inset-x-0 z-20 flex justify-center px-4 transition-opacity duration-[240ms] ease-out motion-reduce:duration-0',
+          completePulseVisible ? 'opacity-100' : 'opacity-0',
+        )}
+        style={{ bottom: 'calc(env(safe-area-inset-bottom, 0px) + 5.1rem)' }}
+        aria-hidden
+      >
+        <div className="rounded-full border border-white/12 bg-black/24 px-3 py-1 text-xs text-white/84 backdrop-blur-md">
+          완료!
+        </div>
+      </div>
       <SpaceTimerHudWidget
         timerLabel={timerLabel}
         goal={goal}
         isImmersionMode
         className="pr-[4.2rem]"
+        onGoalCompleteRequest={handleOpenCompleteSheet}
         onPlaybackStateChange={(state) => {
           if (reducedMotion) {
             playbackStateRef.current = state;
@@ -93,6 +135,21 @@ export const SpaceFocusHudWidget = ({
           playbackStateRef.current = state;
         }}
       />
+      <GoalCompleteSheet
+        open={sheetOpen}
+        currentGoal={goal}
+        onClose={() => setSheetOpen(false)}
+        onRest={() => {
+          setSheetOpen(false);
+          pushToast({ title: '좋아요, 잠깐 쉬고 다시 이어가요.' });
+        }}
+        onConfirm={(nextGoal) => {
+          onGoalUpdate(nextGoal);
+          setSheetOpen(false);
+          pushToast({ title: '다음 한 조각으로 이어갑니다.' });
+          triggerFlash(1200);
+        }}
+      />
     </>
   );
 };
diff --git a/src/widgets/space-timer-hud/ui/SpaceTimerHudWidget.tsx b/src/widgets/space-timer-hud/ui/SpaceTimerHudWidget.tsx
index 648fd82..4da6cdb 100644
--- a/src/widgets/space-timer-hud/ui/SpaceTimerHudWidget.tsx
+++ b/src/widgets/space-timer-hud/ui/SpaceTimerHudWidget.tsx
@@ -1,7 +1,6 @@
 'use client';
 
 import { cn } from '@/shared/lib/cn';
-import { useToast } from '@/shared/ui';
 import {
   RECOVERY_30S_MODE_LABEL,
   Restart30sAction,
@@ -14,6 +13,7 @@ interface SpaceTimerHudWidgetProps {
   className?: string;
   isImmersionMode?: boolean;
   onPlaybackStateChange?: (state: 'running' | 'paused') => void;
+  onGoalCompleteRequest?: () => void;
 }
 
 const HUD_ACTIONS = [
@@ -28,8 +28,8 @@ export const SpaceTimerHudWidget = ({
   className,
   isImmersionMode = false,
   onPlaybackStateChange,
+  onGoalCompleteRequest,
 }: SpaceTimerHudWidgetProps) => {
-  const { pushToast } = useToast();
   const { isBreatheMode, hintMessage, triggerRestart } = useRestart30s();
   const normalizedGoal = goal.trim().length > 0 ? goal.trim() : '이번 한 조각을 설정해 주세요.';
 
@@ -76,24 +76,18 @@ export const SpaceTimerHudWidget = ({
                 {timerLabel}
               </span>
             </div>
-            <div className="mt-1.5 min-w-0 rounded-lg border border-white/10 bg-black/16 px-2.5 py-1.5">
-              <div className="flex items-center justify-between gap-2">
-                <p className="text-[10px] font-medium uppercase tracking-[0.12em] text-white/55">Goal</p>
-                <button
-                  type="button"
-                  onClick={() => {
-                    pushToast({ title: '완료(더미) — 다음 조각으로 갈까요?' });
-                  }}
-                  className="inline-flex h-5 w-5 items-center justify-center rounded-full border border-white/16 bg-white/[0.05] text-[10px] text-white/78 transition-colors hover:bg-white/[0.12]"
-                  aria-label="목표 완료"
-                  title="목표 완료"
-                >
-                  ✅
-                </button>
-              </div>
-              <p className={cn('mt-0.5 truncate text-sm', isImmersionMode ? 'text-white/90' : 'text-white/88')}>
-                {normalizedGoal}
+            <div className="mt-1.5 flex min-w-0 items-center gap-2">
+              <p className={cn('min-w-0 truncate text-sm', isImmersionMode ? 'text-white/88' : 'text-white/86')}>
+                <span className="text-white/62">이번 한 조각 · </span>
+                <span className="text-white/90">{normalizedGoal}</span>
               </p>
+              <button
+                type="button"
+                onClick={onGoalCompleteRequest}
+                className="shrink-0 rounded-full border border-white/16 bg-white/[0.04] px-2 py-0.5 text-[10px] text-white/70 transition-colors hover:bg-white/[0.1] hover:text-white/86"
+              >
+                완료
+              </button>
             </div>
             {hintMessage ? (
               <p className={cn('mt-1 truncate text-[10px]', isImmersionMode ? 'text-white/52' : 'text-white/52')}>
diff --git a/src/widgets/space-workspace/ui/SpaceWorkspaceWidget.tsx b/src/widgets/space-workspace/ui/SpaceWorkspaceWidget.tsx
index 3608765..ccc9bfc 100644
--- a/src/widgets/space-workspace/ui/SpaceWorkspaceWidget.tsx
+++ b/src/widgets/space-workspace/ui/SpaceWorkspaceWidget.tsx
@@ -182,6 +182,10 @@ export const SpaceWorkspaceWidget = () => {
         goal={goalInput.trim()}
         timerLabel={selectedTimerLabel}
         visible={isFocusMode}
+        onGoalUpdate={(nextGoal) => {
+          setGoalInput(nextGoal);
+          setSelectedGoalId(null);
+        }}
       />
 
       <SpaceToolsDockWidget