Question : What are the best ways to find a job as a foreigner in Montreal?

The same strategies that apply to most people will apply to a foreigner. Suggest you look at various jobs on job boards, attend networking events, go to job fairs, make cold calls to prospective employers and network with any friends or contacts you have. Make sure you have a good CV and know how to ace an interview. I would take advantage of the many immigrant organizations and community groups that help newcomers adjust to life in Canada.