diff --git a/src/main/java/com/gdschongik/gdsc/domain/study/domain/StudyDetailValidator.java b/src/main/java/com/gdschongik/gdsc/domain/study/domain/StudyDetailValidator.java
index 2f0c4023b..e6a02f0f3 100644
--- a/src/main/java/com/gdschongik/gdsc/domain/study/domain/StudyDetailValidator.java
+++ b/src/main/java/com/gdschongik/gdsc/domain/study/domain/StudyDetailValidator.java
@@ -29,8 +29,12 @@ private void validateStudyMentorAuthorization(Member member, StudyDetail studyDe
         }
     }
 
-    private void validateDeadLine(LocalDateTime deadline, LocalDateTime curriculumStartDate) {
-        if (deadline.isBefore(curriculumStartDate)) {
+    private void validateDeadLine(LocalDateTime deadline, LocalDateTime studyStartDate) {
+        if (deadline.isBefore(LocalDateTime.now())) {
+            throw new CustomException(ASSIGNMENT_DEADLINE_INVALID);
+        }
+
+        if (deadline.isBefore(studyStartDate)) {
             throw new CustomException(ASSIGNMENT_DEADLINE_INVALID);
         }
     }