Reduce your sentence first to a subject and verb. We'll do this first example in the present tense. Add a time phrase.
Time goes before place.
Now put the sentence without the modal into the past using the present perfect tense. A conjugated form of haben or sein takes the place of spielen. Sportplatz gespielt Now add a modal in the past tense. Remember that the modal shows the tense. Always use an infinitive with a modal.