His home club is the Banook Canoe Club in Dartmouth, Nova Scotia, Canada. McCoombs competed at the 2012 Summer Olympics in the C-1 200 metres event placing 12th. At the 2013 Under-23 World Championships in Niagara he claimed the silver medal in the C-1 200m.
As a 16-year-old at the 2009 Canada Games McCoombs represented Nova Scotia where he won three gold medals, two individually in the 200 and 500 m, as well as one in the C-2 1000 m. He won another three gold medals at the 2010 Junior Pan American Canoe Championships in Mexico in the C-1 200m, 500m and the C-2 200m. In addition he won two silver medals in the C-1 1000m and C-4 1000m.
