You may be able to change the layout of your shower, but this depends on how much you’re willing to spend. For instance, if you want to move the existing shower head to the opposite side, a plumber will need to reroute a waterline, which can cost $600 or more.
Other changes may not be feasible without a full bathroom remodeling project. Make sure to consult with your plumber before you purchase materials to ensure your plans are within budget.