Pensri Srisawat and Naiyana Buppawrong (2017). Proceedings of the 3rd International Conference on Innovation in Education. Thailand: Institute for Innovative Learning, Mahidol University 111 Development of Physical Education Teacher’s Learning Management Competencies by Using Online Social Network Pensri SRISAWAT and Naiyana BUPPAWRONG Faculty of Education, Institute of Physical Education Suphanburi, Thailand srisawatt.ps@gmail.com Abstract: The purposes of this study were: to investigate the physical education teacher’s need of learning management competency development by using online social network; to create a model of learning management competency development by using online social network; and to investigate the effectiveness of learning management competency development by using online social network. This study comprised three stages. The first stage was designed to investigate the physical education teacher’s need of learning management competency development by using online social network. The constructed questionnaire was used for collecting the data from 79 samples by simple sampling method. The second stage contained analyzing and synthesizing the results from the first stage, doing focus group of 10 experts in physical education and information technology, and conducting model quality assessment by a panel of 15 experts. The third stage was to study the results of learning management competency development by using online social network. This stage was conducted with the experimental group of 35 physical education teachers. The data were then analyzed by mean, standard deviation and t-test. The results of this study revealed that the physical education teacher’s need of learning management competency development by using online social network in Institute of Physical Education was found in a highest level. The components of competency development model consisted of 1) investigating competency development need, 2) planning competency development, 3) developing competency, and 4) evaluating competency development. The efficiency of this model was found at 81.20/82.67 which was higher than the given criterion. The physical education teacher’s competency after training was higher at the significant difference level of .05, and their satisfaction was found at a highest level. Keywords: competency development, learning management, online social network, training, physical education teacher 1. Introduction Teaching in the 21 st century has been transformed into its current technological changes because of global ways of life, intellectual competition, and updated information. In order to fulfill learners’ technological skills in the 21st century, however, designing learning management plans was supported for learners’ self-directed learning, and teachers’ instructional facilitation with different teaching approaches was also served for learners’ cooperative learning management. For example, learners’ integration with other courses was resulted from learners’ interesting problem identification and participation in their group activities [1]. Besides effective instructional management, the teachers’ roles in their qualified characteristics depended on learning coaching, learning travel agents. However, teachers’ academic knowledge in the 21st century was not only needed for their teaching, but also the teachers’ roles in shaping up learners’ required career skills were supported. Also, teachers’ applications of technological devices integrated with other