The spread of the coronavirus (COVID-19) strongly affected educational management in Thailand. This gave rise to the problem of how to improve the quality of students of all ages through 100% online learning, be this in areas of knowledge, abilities, skills, and attitudes towards learning. Therefore, the Secretariat of the Education Council of Thailand studied the learning loss of basic education students during COVID-19 and recommended ways to solve the problem using the seven measures derived from the RECOVER Model. Based on this, the researchers devised a project and conducted it along with agency administrators and school administrators under Bangkok Metropolitan Administration, Bang Khen District. Their objective was to evaluate the development of learning management competency using digital technology among teachers in a Bangkok school in order to facilitate the learning loss recovery of basic education level students. The results revealed that participants responded strongly to the overall project process and activities (Mean = 4.71, S.D. = 0.57) with the level of knowledge developed from the relative gain score at a high level (GS = 72.12) and 75.00 percent had the ability to create educational Line stickers for sale in the Sticker Shop. In addition, participants' behavior changed as a result of applying the knowledge, abilities, and skills acquired to teaching and learning in their own subjects. Consequently, the schools to which they are affiliated were able to facilitate the learning loss recovery of students extremely well through the combined participation of administrators, teachers, students, and parents.