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Modern era is looking at the sustainable energy for a permanent solution to the future power demand all over the world whereas the countries of the third world like Bangladesh is still failure to meet the present basic power demand. St. Martin Island is one of those places which are still out of national grid in Bangladesh. More than 8000 inhabitants belonging to about 1200 families are living there but only 26.4% of them are connected to electricity. Moreover grid connected electric system is quite impossible even in future because of costs and geographic location. Present electricity demand is partially fulfilled by the stand-alone diesel generators only for four hours per day which are also badly affecting the ecological balance and environment with a large amount of CO2 emission. This paper has been documented as a small attempt to give a solution of the power crisis of St. Martin Island with optimizing hybrid power generation scheme concentrating on sustainable energy. Using HOMER analysis, an optimum configuration is established among a set of systems to supply electricity to about 1400 families, 150 shops, 100 hotels and various organizations. The load calculation for the whole island has an outcome of a demand of energy about 4000KWh per day with a peak load of 504KW. This system which is the best one chosen from the output results from HOMER, incorporates a combination of 600KW decentralized Solar PV, 3 wind turbines of 1.8 KW each, 2000 batteries of 800Ah each, 300KW biomass generator and 15KW diesel generators to fulfill the whole power demand of St. Martin