Koshiro Sumi is a 23-year-old professional football player from JPN. He currently plays for Jubilo Iwata, wearing the number 39 shirt. He plays primarily as a Defender. He stands at 165cm tall and weighs 62kg. His preferred foot is Right. His current market value is estimated at 600K €.

His most recent move was a from Tsukuba University to Jubilo Iwata on 2025-01-31.

Throughout the Japanese J2 League 2025, Koshiro Sumi featured in 37 matches, averaging 0.5 tackles, 0.1 interceptions, and 0.2 clearances per game, while blocking 0.3 shots per game.