Grouper management is crucial in Indonesia due to its high economic and ecological value. Uniquely, on Ayau Island, Indonesia, grouper management is approached using locals known as Sasi. This study aimed to analyze the sustainability status of the grouper fishery on Ayau Island, which utilizes the Sasi Law. Primary data were collected through interviews with local fishermen and traditional figures. Direct observations were made on the fishing grounds to observe the operational aspects. Secondary data were obtained from the marine and fisheries service of Raja Ampat Regency. A multidimensional scaling (MDS) techniques werer used for data analysis with the RAPFISH tool to assess five dimensions of fisheries sustainability: ecological, economic, social, technological, and institutional. The results show that the economic dimension has the highest sustainability index, while the technological dimension has the lowest. This reveals that local fishermen are in need of the support and attention of the local government. The attribute of compliance with regulation represents Sasi Law and is included in the social dimension. The results highlight the importance of Sasi Law, which exhibits high sensitivity values. This research underscores the diverse dimensions and attributes ensuring the sustainability of grouper fisheries, with Sasi Law serving as a key parameter in the social dimension.