diff --git a/server/src/main/java/sunflower/server/application/SessionService.java b/server/src/main/java/sunflower/server/application/SessionService.java
index c726785..315eacc 100644
--- a/server/src/main/java/sunflower/server/application/SessionService.java
+++ b/server/src/main/java/sunflower/server/application/SessionService.java
@@ -38,7 +38,7 @@ public void extendTime(final Long sessionId) {
 
     @Transactional
     public void logout(final Long memberId) {
-        final Session session = sessionRepository.getByMemberId(memberId);
+        final Session session = sessionRepository.getByMemberIdAndIsLoggedInTrue(memberId);
         session.logout();
     }
 }
diff --git a/server/src/main/java/sunflower/server/entity/Session.java b/server/src/main/java/sunflower/server/entity/Session.java
index af6881f..502bdfb 100644
--- a/server/src/main/java/sunflower/server/entity/Session.java
+++ b/server/src/main/java/sunflower/server/entity/Session.java
@@ -26,6 +26,7 @@ public class Session {
     private Long memberId;
     private LocalDateTime createdAt;
     private LocalDateTime expiredAt;
+    private Boolean isLoggedIn = Boolean.TRUE;
     private Boolean deleted = Boolean.FALSE;
 
     public Session(final Long memberId) {
@@ -43,7 +44,7 @@ public static Session of(final Long memberId) {
     }
 
     public boolean isValid() {
-        if (this.deleted == Boolean.TRUE) {
+        if (!this.isLoggedIn) {
             return false;
         }
         // TODO: 현재는 만료 시간만 체크중이지만, 이후에 IP 등 다양한 검증 로직 추가
@@ -57,6 +58,6 @@ public void extendTime() {
     }
 
     public void logout() {
-        this.deleted = Boolean.TRUE;
+        this.isLoggedIn = Boolean.FALSE;
     }
 }
diff --git a/server/src/main/java/sunflower/server/repository/SessionRepository.java b/server/src/main/java/sunflower/server/repository/SessionRepository.java
index 7a2cb9a..472bcdf 100644
--- a/server/src/main/java/sunflower/server/repository/SessionRepository.java
+++ b/server/src/main/java/sunflower/server/repository/SessionRepository.java
@@ -16,13 +16,15 @@ default Session getById(final Long id) {
         return session.get();
     }
 
-    default Session getByMemberId(final Long memberId) {
-        final Optional<Session> session = findByMemberId(memberId);
+    default Session getByMemberIdAndIsLoggedInTrue(final Long memberId) {
+        final Optional<Session> session = findByMemberIdAndIsLoggedInTrue(memberId);
         if (session.isEmpty()) {
             new AuthException();
         }
         return session.get();
     }
 
-    Optional<Session> findByMemberId(Long memberId);
+    Optional<Session> findByMemberId(final Long memberId);
+
+    Optional<Session> findByMemberIdAndIsLoggedInTrue(final Long memberId);
 }