Tolvanen was selected to represent Team Finland at the 2016 IIHF World U18 Championships where he helped Finland win gold. The following years he played for Team Finland in the 2017 World Junior Ice Hockey Championships and the 2018 World Junior Ice Hockey Championships. Tolvanen was also selected to play for Team Finland at the 2018 Winter Olympics. In his Olympic debut, he recorded four points to help Finland beat Germany 5–2. He ended the tournament with 9 points in 5 games.