Can I use my Gemini android smart tablet with a sim card for Internet on virgin
No reason why not - assuming you choose the right size SIM.
From the limited googling I've done, it looks like it will accept a phone SIM too - so if the one you have in your existing handset is the right size, you can try it out and see how well it does.
Be very careful, though. If you start making and receiving calls (which, apparently, is possible) you will look a bit of a loony with something that size held to your ear.