At the club level he plays with Kanturk, while he is also a member of the Cork senior hurling team.
He was part of the Kanturk senior hurling team that won the Cork SAHC title after a defeat of Fr.
[1] He was also part of the Kanturk intermediate football team that won the Cork PIFC title after a defeat of Bantry Blues in 2022.
[2] O'Sullivan has also lined out with the University of Limerick and won a Fitzgibbon Cup title in 2022.
[3] O'Sullivan first appeared on the inter-county scene as captain of the Cork minor hurling team in 2018.