Sheridan made his debut on the inter-county scene when he was picked for the Mayo under-21 team. He won back-to-back
Connacht medals in this grade, however, an
All-Ireland medal remained elusive. Sheridan made his senior debut during the
1995 championship. He was a regular on the starting fifteen over much of the next decade and won three
Connacht medals and one
National Football League medal. He was an
All-Ireland runner-up on two occasions. ==Managerial career==