[3] Simultaneously he worked as an assistant of the AC Oulu first team in the second-tier Ykkönen in 2018, with head coach Mika Lähderinne.
In September 2022, Isokangas was named the head coach of Oulun Luistinseura (OLS), the reserve team of AC Oulu, starting in the 2023 season.
[6] In June 2024, after AC Oulu had fired its whole first team coaching staff,[7] Isokangas was named an interim manager with Rafinha.
They helped the club to advance to the round of 16 of the 2024 Finnish Cup,[8] and get an away draw against Vaasan Palloseura (VPS) in the league.
In September 2024, after AC Oulu had fired their new coach Kostas Bratsos due to three consecutive red cards, Isokangas was named the caretaker manager of the first team for the remainder of the 2024 season.