Before moving to Canada, Ohin played football in Ghana from 2008 to 2010 before being recruited by a club in Switzerland, where he played from 2010 to 2011. He later played in Germany, Thailand and Sweden. In 2016, Ohin began playing with USL Premier Development League side WSA Winnipeg and made nine appearances that season, scoring one goal. In 2017 he made eight appearances and added four goals, and made another eight appearances in 2018. On 10 January 2019, Ohin signed with Canadian Premier League side Valour FC He made his debut on 11 May 2019 as a substitute in a 1–0 win over HFX Wanderers FC. Ohin scored his first goal for Valour in 2021, his third year with the club, scoring the first goal in a 2–0 victory over Atlético Ottawa. 2021 turned out to be a breakout year for Ohin, Valour, despite just missing the playoffs, experienced more success than previously, and Ohin was named in the Canadian Premier League Team of the Week three times. In December 2021 Valour announced they had re-signed Ohin for the 2022 CPL season. Ohin is Valour FC’s all-time appearance leader with 57 for his hometown club.