You can easily do it on localbitcoins.com check the trader from Canada who is giving the best rates and it will be done within minutes.
Thanks to both of you for your answers which seem similar.
Basically, you suggest I buy BTC from a local trader in Canada.
I understand, but how will this Local Canadian BTC Seller accept Rupees that are in my SBI NRO account?
Do you mean I need to find a Canadian NRI who has BTC?