Ian Müller plays beach volleyball for TSV Unterhaching and competes in the federation “Bayerischer Volleyball-Verband”.
Currently listed in BVV U14 Herren 2025 (rank 44, 50 points); BVV U16 Herren 2026 (rank 53, 125 points); BVV U16 Herren 2025 (rank 113, 50 points). Ranking seasons: 2025–2026.