Sandercock taught Human Society and its Environment (HSIE) subjects at The Pittwater House Schools in Sydney, alongside his role on the coaching staff of the Manly-Warringah Sea Eagles before joining the Newcastle Knights in 2010 to be an assistant coach.
[2][3] In 2012, he was appointed the head coach of Hull Kingston Rovers.
[4] On 8 September 2014, it was announced that Sandercock would be returning to the Newcastle Knights as assistant coach to newly appointed head coach Rick Stone.
[6] He was, until May 2024, head coach of the Canterbury-Bankstown Bulldogs Women[7] He was previously assistant coach to the Bulldogs men's NRL team and the head coach of Super League team Hull Kingston Rovers.
On 24 May 2024 he was appointed head coach of Wyong Roos[8]