On 6 May 2017, Poon made his HKPL debut for Biu Chun Glory Sky in the match against Tai Po at the age of 16.

On 23 March 2023, Poon made his international debut for Hong Kong in a friendly match against Singapore.

Poon scored his first two international goals in the friendly match against Brunei on 11 September 2023, helping Hong Kong to a 10–0 victory.

[3] On 1 October 2023, he scored the only goal in the quarter-final match against Iran, helping Hong Kong to advance to their first semi-final appearance in the competition.

[4] On 26 December 2023, Poon was named in Hong Kong's squad for the 2023 AFC Asian Cup.