In 2011, Law won a scholarship to study at BSix Sixth Form College, following in the footsteps of Tan Chun Lok and Leung Nok Hang.

On 15 July 2016, Law was named to the Hong Kong U-21 preliminary squad for a tournament in Singapore.

In July 2017, he was selected for the Hong Kong U-23 for the 2018 AFC U-23 Championship qualification tournament in North Korea.

He made his debut for the Hong Kong B squad in October 2017 for the Interport Cup against Macau, earning praise from his future Yuen Long manager Kowk Kar Lok.

[4] In October 2018, Law was called up to the senior Hong Kong squad by Gary White for a friendly against Indonesia but was an unused substitute.