[1] He spend his majority professional career at Penang FA, his birthplace football team.

Kamarulzaman represented the Malaysia national football team 8 times in 2000, during the height of his career.

He, along with Muhamad Khalid Jamlus and Azmin Azram Abdul Aziz, was dropped from the national squad in early 2001 for staying out late at a disco before the 2002 World Cup preliminary games against Qatar, Palestine and Hong Kong.

With the pressure of winning the first gold medal in football since 1989 SEA Games, also in Malaysia, and in front on the home fans, Kamarulzaman, who until then were playing the best football of his career, made a grave mistake.

A harmless cross from Sarawut Treephan, was deflected by Kamarulzaman who try to clear it, into the back of his own net.