Two time Hong Kong entry

Hi,
I am India passport holder. I want to ask if I can enter Hong Kong twice within a period of 4 days.
I am arriving Hong Kong and staying in Hong Kong for 2 days and then going to Mainland China for 3 days ( for this I have visa). On the way back from Mainland China, I am planning for staying in Hong Kong for 2 days again. Is it possible to enter multiple times in Hong Kong or do I need Visa for 2nd time entry.
Thanks.