Yes, there is no law (I know of in any jurisdiction of which I am aware, but check in your jurisdiction to be sure) against a divorced couple resuming a romantic relationship or from remarrying.
Utah Family Law, LC | divorceutah.com | 801-466-9277
https://www.quora.com/Can-you-go-back-to-your-ex-spouse-after-a-divorce/answer/Eric-Johnson-311