During his playing career, Sweeney ran out 69 times in the Chiefs jersey and played over 100 games for Waikato in NPC. He has also played for the Māori All Blacks, New Zealand Barbarians and returned to play for Thames Valley in the 2022 Heartland Championship.
Off the field, Sweeney has been an assistant coach for the successful Waikato Women’s Sevens team who was national runner-up in both 2018 and 2019, and was an assistant coach for the Waikato NPC team.
He returned to his former club in 2024 to take on an Assistant Coaching position with the Chiefs Manawa