While still playing for the St Johnstone first team, Sheerin coached their under-17 team that won the
SFL Under-17 Youth Division in 2008–09.
Arbroath manager On 27 May 2010, Sheerin was confirmed as the new player/manager of
Arbroath. Sheerin guided Arbroath to the
Third Division championship in his first season in charge, the club's first national trophy win in their 133-year history. He agreed a new contract with Arbroath at the end of the 2010–11 season. Arbroath were relegated after finishing last in the
2013–14 Scottish League One.
Aberdeen After the end of the season, Sheerin left Arbroath and became the manager of
Aberdeen's
under-20 team. Aberdeen won the
Development League title in his first season in
2014–15. The under-20 team also reached the
Scottish Youth Cup final in
2017–18, but lost 3–1 to
Hibernian. Following the departure of
Derek McInnes on 8 March 2021, Sheerin was appointed interim manager at Aberdeen. Sheerin took charge of one game, a 1–0 defeat against
Dundee United, before the club appointed
Stephen Glass as the new manager.
Falkirk manager On 28 May 2021, Sheerin was named as the new head coach of
Scottish League One side
Falkirk. He was sacked by Falkirk after a 6–0 defeat by
Queen's Park that left them in fifth place, three points outside of the promotion play-off positions. Soon after leaving Falkirk, Sheerin took up a coaching position with Derek McInnes at
Kilmarnock in January 2022. Sheein became Kilmarnock assistant manager in June 2023, after
Tony Docherty had left the club to become
Dundee manager. ==Managerial statistics==