This WEB paper analyzed Japan’s supply chain policy in line with the implementation of Japan’s Economic Security Promotion Act in May 2022, and presented policy implications such as supply chain cooperation between Korea and Japan. First, this paper analyzed the US-led reorganization of the global supply chain and the Japanese government’s response to it. In particular, the Japanese government’s economic security policy was evaluated from the perspective of how Japan approaches the US-led the global supply chain reorganization. Second, the Japanese government’s supply chain policy was analyzed, focusing on the supply chain policy for some critical materials under the Economic Security Promotion Act. Finally, this paper proposed ways for Korea and Japan to cooperate in reshaping the global supply chain led by the United States.