As a player, Åhnstrand was a member of GIF Sundsvall and Söderhamns FF, before suffering an injury that forced him to retire.
[3][4] While coaching the club, in November 2015, he was admitted to the UEFA Pro Licence programme.
[5] Åhnstrand was appointed assistant coach at his former club GIF Sundsvall in November 2017, a position he shared with Ferran Sibila.
[1] After long-time manager Joel Cedergren was dismissed in August 2019 due to disappointing results, and his successor Tony Gustavsson failed to turn the tide, Åhnstrand was promoted to the position as manager in December 2019.
[8] Åhnstrand was sacked on 28 July 2022, as GIF Sundsvall were second to bottom in the league with 10 points in 15 games.