Its almost impossible to get back the disabled Google Adsense accounts.
Any case, let us know whether your application for Adsense account is rejected, or your functioning Adsense account is disabled ? ( As people often confuse between these two)
If your case is of application rejection, you can apply again, you can get the approval in due course, after satisfying Google TOS.
If your case is of Adsense account banning due to non-compliance of Google TOS, there is very little chance of getting it back.