Yes sausage gravy can be reheated
When you have leftover sausage gravy you can put the leftover sausage gravy into a freezer safe container or a Ziploc bag.
Then freeze it or refrigerate it.
Then just reheat the sausage gravy in the microwave or in a skillet.
Sausage gravy can be kept in the refrigerator for 4 days and up to a year in the freezer.
You can make sausage gravy and then freeze it to use later.
I make additional sausage gravy and then put it in Ziploc bags and then freeze it for use later.