He currently plays for FC Sion, wearing the number 40 shirt. At the international level, he represents Switzerland U20. He plays primarily as a Goalkeeper.

His most recent move was a Free from Basel U21 to FC Sion on 2026-01-15.

In the Elite League U20 2025-2026, Simon caillet played 2 matches, averaging 0 interceptions, 0 tackles, and 0 clearances per game.