to my understanding - no.. can SIN card is used when some one need to work in canada. so if the applicant is resided in HK, what's the point to apply SIN as no way of working in canada....
oops, sorry, then I think I misunderstood you, the one I got in HK is the citizenship card公民証, after you got that, you can apply for the SIN card in Canada which you must apply in Canada.