You could try that . . . he'd need an employer to sponsor him for a temporary work permit, and that employer would have to get HSRDC approval to offer him a job. That means that the employer must demonstrate that there are no qualified Canadian applicants. It's not an easy process - and it's not a quick one either. There's also the
BUNAC working holiday visa that he could apply for if he meets certain criteria. You're really up against it, though. Canada does not make it easy for potential sponsors to bring a partner to Canada without benefit of marriage or an already established common-law partnership.