Koshiro Sumi is a professional footballer from JPN and is currently 24 years old. He is on the books of Jubilo Iwata and wears shirt number 39. His main role on the pitch is Defender. He measures 165cm in height and weighs 62kg. His stronger foot is Right. His estimated market valuation currently stands at 600K €.

His latest transfer saw him join Jubilo Iwata from Tsukuba University via on 2025-01-31.

Across the Japanese J2 League 2025, Koshiro Sumi appeared in 37 matches and averaged 0.5 tackles, 0.1 interceptions, 0.2 clearances, and 0.3 blocked shots per game.