He currently plays for Onsala BK, wearing the number 5 shirt. He plays primarily as a Defender.

His most recent move was a from BK Häcken U19 to Onsala BK on 2017-08-11.

Throughout the Sweden Cup 2025-2026, Sebastian·Heaver featured in 2 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.