Ewanuick was born and raised in Port Moody, British Columbia, Canada. He worked in a bingo hall until his high school graduation from Port Moody Secondary School, in 1989.
At college he enrolled in English, Women’s Studies and Theatre courses, the only courses available, subsequently failing all three. After auditioning and being accepted into the two-year theater intensive program, he was asked to leave one year into the program.] He subsequently trained for four years with acting coach Shea Hampton, with whom he continues to study in Vancouver, British Columbia, where he also resides.
He made his television debut on The New Addams Family in 1998 as a "spinning gnome". Following guest appearances on both Canadian and American television series such as Cold Squad, Monk, Dark Angel, The Twilight Zone, Da Vinci's Inquest and Tru Calling, Ewanuick became a regular on the CTV series Corner Gas, as Hank Yarbo. The series was a hit, making Ewanuick a familiar face in Canadian households. In 2005, he began starring simultaneously in the CTV comedy-drama series Robson Arms with Corner Gas co-star Gabrielle Miller.
Ewanuick has appeared in numerous films, including The Delicate Art of Parking (2003), which premiered at the Montreal World Film Festival. The film won the Best Canadian Feature prize. Later, Ewanuick won a Best Actor award at Spain's Peñiscola Comedy Film Festival for the same film. In the comedy Young Triffie (2007), Ewanuick stars as a young Newfoundland Ranger investigating a crime.
In late 2008, CTV commissioned a half-hour sitcom pilot for a new comedy titled Dan for Mayor, starring Ewanuick as Dan. In 2013, he played Paul Swindell in Swindle. In 2014, Ewanuick reprised his role as Hank Yarbo in Corner Gas: The Movie.
- He's an avid hockey goaltender and a Vancouver Canucks fan.