It's pretty much impossible for a foreign worker to get a job in Canada as a teacher. Canada as far more quaified teachers than teaching jobs available.
However if you want to look for jobs in Canada, then you would want to be looking at reputable job sites such as linkedin, indeed, workopolis, etc.
Note that you will most likely need to be certified as a teacher in Canada before you will be able to each. Each province has a different process for this certification.