He currently plays for Ullensaker/Kisa IL, wearing the number 5 shirt. He plays primarily as a Defender.

His most recent move was a from Strommen to Ullensaker/Kisa IL on 2024-01-31.

Throughout the Norwegian 2.Divisjon 2025, sebastian gjelsvik featured in 25 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.