Koshiro Sumi is a 24-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 current market value is estimated at 600K .

His most recent move was a from Tsukuba University to Jubilo Iwata on 2025-02-01.

Throughout the J2/J3 100 Year Vision League 2026, Koshiro Sumi featured in 4 matches, averaging 1.3 tackles, 0.8 interceptions, and 0.3 clearances per game, while blocking 0.8 shots per game.