Background: The shift from traditional education to competency-based education in response to societal demands, emphasizes the need for developing assessment tools to measure major competencies—comprising knowledge, skills, attitudes, and personal characteristics—required to perform specific tasks. Thus, It is essential to develop assessing tools to measure the existing major competencies in physical therapy, enabling more effective management of educational outcomes on competencies. Objectives: The purpose of this study is to develop an assessment tool for measuring major competencies within the Department of Physical Therapy. Design: Delphi survey research. Methods: This study was conducted based on the three major competencies and six sub-competencies of the Physical Therapy Department. To develop an assessing tool for measuring major competencies, conversion of the achievement factor into behavioral statements, and expert panel group Delphi survey was conducted. Results: The results of the Delphi survey indicated 0.88 to 1, exceeding the established threshold and demonstrating adequate validity. Conclusion: A total of 54 preliminary questions for the major competency assessing tool were developed through the Major Curriculum Committee. Through the Delphi survey, the validity of the 54 preliminary questions for major competencies was secured.