The purpose of this study is to explore the teacher learning community as an alternative for achieving teacher agency. In addition, it is meaningful for teachers to understand what agency is and to sympathize with its necessity, to achieve agency through the teacher-learning community so that each teacher can grow as an educational subject. To this end, in this study, the concept was established through the ecological approach of teacher agency and theoretical exploration of the Korean teacher learning community, and then two teacher learning communities were selected as examples based on this concept. Data were collected and analyzed using document analysis and interview methods. According to the research results, in the ecological approach of teacher agency, teacher agency is a phenomenon that emerges through organic interactions between individuals and environmental contexts in the passage of time, and is achieved rather than owned by individuals. Agency can be complementarily achieved in the teacher learning community, and the teacher learning community can be an alternative approach for achieving teacher agency for three reasons. First, the teacher learning community is because its members jointly pursue the value of learning and sharing. Second, the teacher learning community expects high cooperation from its members, and practical cooperation is achieved. Third, the teacher learning community is because the experience of the community is practically applied to personal or teacher life so that you can understand the original self and self as a teacher. Finally, the necessity for empirical research was suggested based on this, along with establishing the concept of teacher agency and teacher learning community theory suitable for the Korean situation.