have a look around at the Canadian immigration website
http://www.cic.gc.ca/english/index.htmlHowever, there is limited information at the moment about spousal/partner sponsorship on the website. They removed the information some time ago, and have yet to replace it with the new rules. You may need to speak to an immigration lawyer in Canada to get the new forms and whatnot.
In Canada, it is possible to sponsor a common-law partner, conjugal partner, or same-sex partner or a spouse. Processing times are loooooooooooooong, so be prepared for a wait.