But also, @brynner @rvaca2 your schools do have clubs that meet in highschool still. A band for instance meets in a music room. That could be considered a “club room” in this context. A history club meeting in the history teacher’s room after school could also be considered a club room.
However, in Japan, they have dedicated (and often multi-purpose) rooms for these functions, for any and every extra-curricular club. Those are club rooms. (If you watch any highschool anime, you will encounter them.) That aside, my University (in Canada) also had club rooms, although they were shared (and more like brynner’s example) where we had to book the space for our club in order to use it at the designated time(s).
Hope that helps!