If you are playing v1.1 of Village Sim, you will be able to train a Master Builder by having a villager spend time fixing huts. You'll have to drag a villager to a hut until they have that first litttle bit of skill - after that, you can set their preferred skill to construction and they will work on their own.

If you're playing v1.0, the only thing that will help you is if you get the Island Event where a storm washes more debris onto the beach. If none of your villagers has any construction skill, it will take more than one storm to provide enough training to make a Master Builder.