Yes, you can absolutely use Sheetrock/drywall on curved walls. Whether a barrel vaulted ceiling, archway, or curved half wall, Sheetrock can be “bent” or even scored and installed via individual sections to create curves. It’s important to have the right framing in place to accommodate or even a flexible track fastened to the framing to help get your required shape. The real trick is to wet the Sheetrock (e.g. using a mister bottle) to make it flexible and bendy. Check online for charts to tell you how much water to use based on the minimum radius of the curve you’re doing.