Is there any sport where south and north Ireland played together?

The answer to this question is yes. There are a number of sports where south and north Ireland play together, including:

* Rugby union: Ireland competes as a single team in international rugby union tournaments.

* Cricket: Ireland competes as a single team in international cricket tournaments.

* Hockey: Ireland competes as a single team in international hockey tournaments.

* Golf: Ireland competes as a single team in international golf tournaments.

In addition to these sports, there are also a number of other sports where south and north Ireland compete together on an occasional basis, such as basketball, volleyball, and tennis.