Sacks was born in Sydney. He first got into acting after a bit part in an episode of The Love Boat when it was filming in the Pacific. His first role came about in the series The Restless Years in the late 1970s, which started him on the television circuit in Australia. He emigrated to Hollywood in the 1980s, guest starring in series such as thirtysomething, but preferred Australia, and so he returned there after a few years. Also had guest appearances in: Love in Limbo, Encounters, Irresistible Force, Fields of Fire III, All the Way, Touch the Sun: Princess Kate, Slate, Wyn & Me, Tricheuse, La, Emoh Ruo, Stock Squad and The City's Edge.