Where did you find the information that you will need a license to apply for regulated occupation? All you need is the proof of eligibility for getting licensure. Now I don't know the exact procedure of getting the proof of eligibility. Many people got nomination without license and many got declined because of not having incense. But according to guideline you do need to prove that you are eligible to get the license, that's it and having license ready to work in saskachewan even before getting nomination and visa is quite funny or it applicable for onshore applicant.
Please read the application guideline before lodging application.