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A coastal pier is necessary for transportation of commodities and people. The pier is a vital infrastructure, especially for an isolated island, located far from the main land. Koa Kood Island is the fourth largest island of Thailand. Ships visiting the island faced a difficulty during the southwest monsoon because no pier was operational. This study commenced with data collection, including a bathymetric surveying and wind statistics, followed by wave hindcasting using JONSWAP method. Extreme value analysis by Weibull distribution was carried out to specify wave heights of different return periods. MIKE21 PMS was applied to evaluate wave attenuation of candidate sites, and to determine percentage of pier’s downtime.