Under Section 490.02911 of the Criminal Code, if you have been convicted of a sex offence outside of Canada you must notify Canadian police within 7 days of entering Canada. In British Columbia you can contact the BC Sex Offender Information Registration Centre and they will direct you to a registration centre.
If the offence is deemed equivalent to an offence under Section 490.011(1) (a) of the Criminal Code you may be served a Notice and Obligation to Comply with the Sex Offender Information Registration Act (Form 54).
Once you have been served the Notice, you must follow its obligations.
The B.C. Sex Offender Information Registration Centre can be reached at:
Vancouver: 778-290-4003
Elsewhere in B.C.: 1-866-648-5933