Submitted to a non Scopus-indexed journal, later found that University only accept Scopus journals. How can I submit to another journal?
If your paper is submitted but not accepted or published, it is still time to withdraw your submission. This is generally done by writing to the editor. I would recommend to do this as soon as possible to avoid wasting editors and reviewers time.

Now if the entire process is already over and you only have the APC to pay, it might be more difficult to withdraw but you can still try.

Once the paper is published you only option is retraction but I would not go that route just to please your institution's wishes.