 Hoping for a fresh start with a new organization, Chouinard was instead selected once more by the Senators, this time in Round 2 (45th overall) of the 2000 NHL Entry Draft.Chouinard spent three seasons in the Senators' organization, winning the Harry "Hap" Holmes Memorial Award (shared with Martin Prusek and Simon Lajeunesse) during the 2001–02 American Hockey League season.He signed as a free agent with the Los Angeles Kings in July, 2003

Chouinard made his one NHL appearance on February 29, 2004, when the Los Angeles Kings faced the Mighty Ducks of Anaheim at the Arrowhead Pond.