*Club domestic league appearances and goals, correct as of 4 June 2024 (UTC) ‡ National team caps and goals, correct as of 09:59, 22 February 2023 (UTC)
Magnúsdóttir began her senior career at Breiðablik, during which she was loaned to Fylkir in 2015. She remained with Breiðablik until 2021, then transferred to Norwegian side Rosenborg. In January 2024, she signed with Bundesliga club 1. FC Nürnberg,[2] for the remainder of the 2023–24 season before the team's relegation.