Wallin, 34, won a gold medal as an assistant coach with the under-18 team in 2008. As a player he won a Stanley Cup with the Detroit Red Wings in 2002 and a gold with Canada at the 1997 IIHF World Junior Championship.
Gordie Dwyer of the QMJHL's P.E.I. Rocket and Todd Gill of the OHL's Kingston Frontenacs were named assistant coaches.
Ron Tugnutt, Hockey Canada's goaltending consultant, will serve as goalie coach.
"All four bring varying experiences from their coaching and playing days, and we're looking forward to watching them help develop Canada's top young players in the Czech Republic," Brad Pascall, vice-president of hockey operations/national teams, said in a statement Sunday.
Canada is a two-time gold medallist at the world championship, winning in 2003 and 2008. It finished fourth last year in Crimmitschau and Dresden, Germany.
The under-18 world championship will be held April 12-22 in Brno and Znojmo, Czech Republic.