Canada, under the supervision of coach Pat Raimondo, got off to a flying start when Mark Korthuis punished a rebound from Thai goalkeeper Umarin Yaodam in the 33 rd minute.
The home team finally found their momentum in the second session when Anon Sangsanoi scored two straight goals, through a penalty kick in the 59 th minute and a header six minutes later.
Thailand gained the composure from then on as the visitors appeared to lose steams because of the highly humid condition. Wutthichai Tatong came off the bench to add the third goal for Thailand in the 73 th minute before Ekaphan Inthasen finished the feat with a blast in the 90 th minute.
"I couldn't ask for me by scoring two goals. But I could have played better if didn't get tired in the end. But if we could maintain this level, we could make it to the quarter-final,'' said Anon from North Bangkok College.
Thailand will take their next actions against Ireland on Thursday. Thailand, Canada, the Czech Republic and Ireland are drawn into pool A.