Boyfriend moving to China on a Z visa. Can I go and live with him on an S1?

My boyfriend has been given a job in Beijing as a teacher and will move on 6th August on a Z type. Can I, as a girlfriend, get an S1 type so that I can live with him there? I am working on my TEFL qualification at the moment and plan on looking for a job teaching in China as soon as I can, but know I will need to go to HK and apply for a Z type once I get a job offer and not work on the S1 type. Do I need to wait for him to be in China before I can go over on an S1 type? Or can I arrange this and travel out with him?Many thanks in advance.