I don't know about removing it....
I think you might be able to sand it, but that would probably just make a mess.
Is the current texture orange peel? If its not, I think I'd just take a flat putty knife (4-6") and scrape the tops off the bumps.
Others might have a different opinion, but I almost think it would be easier to buy a bucket of mud, water it down and smoothcoat the walls than sand the other stuff off.
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