Malhotra will be joined by Philadelphia Flyers scout Patrick Burke and march with players from the Vancouver Cutting Edges, billed as the only gay hockey club in Western Canada.
The Canucks' centre is the third professional hockey player to participate in Pride events this year under the You Can Play banner.
"It's paramount that equality in sport, and beyond, becomes the norm," Malhotra said Wednesday.
"Everybody has the right to play the game they love," he added.
"I am excited to share this message of equality and show my support this Sunday."
Burke noted that Vancouver has "a wonderful LGBT community and a passionate hockey community."
"We are thrilled to see the Canucks working to bring those two groups closer together," Burke said.
"Having a well-respected warrior in Manny stand up along with Henrik, Daniel, Ryan, and dozens of other NHLers around the League gives hope to young LGBT hockey players everywhere," he said.
The Burkes took part in Toronto's Pride Parade last month.