You can reach there by bus/car from the Chittagong bus-terminal or journeying by boat (only in winter) from South-potenga Airport-jeti to Parki sea-beach. I think to arrive the parki sea-beach by boat-journey will be the exclusive moments of your tour-life. The anchored-ships of 'home and abroad', the sun-set scenery and the natural beauties of the coastal area overflow you with joy. The impression of this sandy sea-beach vibrates you also.
For more information about the world travel you can take a look at deparz.com site.