The PTA Student Council (PTASC) was formed in 1996 to facilitate the running of PTA. Being the subsidiary body of the Association, it helps to carry out most of the plans made by the Association. Moreover, the PTASC acts as the bridge connecting PTA and the students in St. Joseph's College.

The PTASC consists of an executive committee lead by senior students. Students helping in the Council are given opportunities to handle different tasks and to gain experience from their works. Furthermore, throught working with the PTA, a rapport among parents, teachers and students can be developed.