He currently plays for Rosenborg, wearing the number 51 shirt. At the international level, he represents Norway U17. He plays primarily as a Midfield. His preferred foot is Right.

His most recent move was a Loan from Levanger FK to Rosenborg on 2026-06-30.

Across 5 appearances in the Norwegian Eliteserien 2025, Isak Holmen registered 0 goals and 0 assists, while completing 0 key passes out of 0 total passes with a passing accuracy of -.