Director General of Disaster Management John Byrne says the Red Cross has 550 volunteers on standby in Ontario and the Atlantic provinces.
He says the volunteers are ready to swing into action if the storm heading towards the U.S. eastern seaboard causes widespread damage in Canada.
Sandy is expected to make landfall in New Jersey on Monday evening, and Environment Canada says Canadians will feel the effects.
Byrne urges Canadians in Sandy's path to stockpile water, food and other emergency supplies that could last for up to three days.
Many Canadians haven't taken such measures in the past, Byrne suggested, citing a recent poll commissioned by the Red Cross.
The survey of 1,000 Canadians - about half of whom were questioned online - found that 38 per cent of respondents had not assembled an emergency kit that could see them through 72 hours.
One in five of those surveyed said they had simply never considered the possibility of a disaster crippling the flow of supplies.
Byrne urged Canadians not to make that mistake.
"I was out during lunch and overheard a conversation where people were saying, 'oh, this won't be as bad as they say it's going to be.' I cringe at that, because that's the kind of apathy that gets us in trouble," he said.