Three sesarmid crabs, Neosarmatium asiaticum Ragionieri, Fratini and Schubart, 2012, N. indicum (A. Milne-Edwards, 1868), and Tiomanium indicum (H. Milne Edwards, 1837), are reported based on specimens collected from Miyako-jima Island, Ryukyu Archipelago, southwestern Japan. Among these species, N. asiaticum is new to Japanese brachyuran fauna, and N. indicum and T. indicum are reported for the first time from Miyako-jima Island based on the voucher specimens. Differences between the specimen examined in this study and the original description of N. asiaticum are briefly discussed.