I don't think you can restart your RC.
However, if you're patient, there is a way to get back some cash in order to redo your RC layout.
1) First, make sure your popularity to AT LEAST 22.5 - to do so, just monitor your restaurant. Feed your employees so that you don't get a negative rating should they get to be too slow.
2) Once it's 22.5, then close your restaurant. Leave one waiter and one chef awake. Save and Close it.
3) At least 5 hours later, check your RC. You should have 2000 coins and your employees 'dead tired. Put them to bed, put another two to work.
Keep on doing this until you have enough money to do whatever you want to fix up your restaurant. If you can't get your popularity up to 22.5, it's okay. Just put 2 to work and make sure you login at least once a day (to get free ingredients as well). You'll still get coins, but not the maximum 2000.
Good luck.