Due to Unawatuna being located at proximity to major cities like Galle and Colombo, getting here is quite easy. If you are travelling from Colombo you could use the southern expressway to reach here without a hassle. There are three easy ways you could visit Unawatuna from any of the major cities of Sri Lanka.
Bus
This is probably the cheapest option available and buses run regularly between all the major cities and towns of Sri Lanka.