can I change the filing status on an amended return?

Yes, except that you cannot change from married filing jointly to any other filing status after the due date of the original return.*

Why do you want to change the filing status? What was the filing status on your original tax return? What do you want to change it to?

You might want to read the information about filing status in the IRS Instructions for Form 1040-X.

* There is a rare exception to the rule that you cannot change from married filing jointly to any other filing status. The exception is if you were not married, so you were not allowed to file jointly. But in that situation you cannot just file an amended return to change your filing status. You have to follow a special procedure which, as a practical matter, requires using a tax professional.