Yes, Australian labradoodles like to swim. They are bred from Labradors and poodles, which are both water dogs by instinct.
However, each dog is an individual, so how much they like water will depend on how early they were introduced to it. It will also depend on whether their first experiences were positive.
To ensure your Australian labradoodle has a positive experience in water, introduce it gradually, stay close by to help it feel confident, and always ensure it can get out safely. Always make it a fun experience, perhaps with a ball to retrieve and lots of praise.
When the time comes for sea swimming, provide a swimming vest to help it deal with waves and currents. Make sure to be nearby to help in case of difficulties.