This paper explores two case studies, which elaborate how to apply SE in reducing poverty and achieving healthy community. One case looks at the Royal Development Study Center where people can learn how to apply appropriate technology to conduct sustainable agriculture through revitalizing and preserving natural resources. Another case explores a community that applies SE in their integrated community development activities, leading to healthy community. These two cases are among many in Thailand, which demonstrate that balanced and sustainable development can be achieved, if the framework and the process of development are appropriate with social and natural conditions. The paper draws lessons learned from development at the community level to apply at the national/global level. The lesson includes knowledge on managing community toward a healthy community in a sustainable way based on SE.