The energy sector of a country is important in determining the competitiveness of it in the global context. The primary objective of this paper is to determine if Low Carbon policies have any impact on the energy security of the power sector of Thailand and Sri Lanka. The power sectors of the two countries are modeled using Asia-Pacific Integrated Model (AIM)/Enduse model and the energy security is assessed using three indicators which measure diversity of supply, oil share and gas share and the renewable fuel share of the power sectors. Two Low Carbon Society (LCS) scenarios are modeled for each country, named LCS1 and LCS2 along with the BAU case. The modeling horizon is 2010-2050. Results show that there is significant increase in energy security in the more advanced LCS scenario, with higher penetration of low carbon actions and measures. In addition to this, there is significant reduction in energy consumption and high mitigation of CO2 in both the LCS scenarios.