A trainer since 1977, Attard is based at Toronto's Woodbine Racetrack, where he has led all trainers in wins four times. On December 6, 2008 he won his 1,600th career race with Forever Gleaming. On November 14/2010 he won his 1,700th career race in the Autumn Stakes with Stunning Stag. In February 2011, the Brampton Guardian announced that Sid would be a 2011 inductee of the Brampton Sports Hall Of Fame.
A resident of Bramalea, a neighbourhood in Brampton, Ontario, Attard and his wife Janice have three children. Their sons Paul and Jamie have followed in their father's footsteps and are trainers at Woodbine Racetrack.