There are many routes you can take to become an ergonomist. Such routes usually involve a) special distinctions that set you apart from the competition, b) an under graduate degree that relates to or is about ergonomics, c) co-op or mentorship work experience, d) a post-graduate ergonomics degree, e) major work experience, and f) certification
The most common routes are: Distinction > Related Undergrad > Co-op > Work Related Undergrad > Co-op > Post-grad > Work *Certification requires an extensive amount of both work experience and education & thus comes last