This study aims to propose design directions for the sustainable campus master plan in terms of the expansion of the boundary. For this purpose, theoretical investigation and thorough site analysis were conducted first. Then, design methodology related to the expansion of the boundary was developed, and three design alternatives were proposed. The conclusion extracted from the design exploration is that the university campus should be linked to city community for the long-term campus development plan, which is an integral part of a sustainable campus in the process of expansion.