This class action research required to develop online counseling teaching. The objectives were 1) to develop a learning management plan for an online counseling unit that promotes the competency in the counseling service of teaching professional students and 2) to study the change in the competency in the counselling service after studying with the online counseling unit learning management plan. The target group was teacher professional students, faculty of education, Government University in Thailand, who enrolled in the course of educational psychology and teacher guidance, academic year 2021. The instruments used in this research were: 1) the counseling unit learning management plan 2) a model reflecting learning outcomes in the counseling unit, and 3) a knowledge test in the counseling unit. The researchers analyzed quantitative data with percentile analysis and qualitative data with content analysis. The results showed that most of the students had 70% or more of post-learning knowledge of counseling. It reflected that learning counseling is useful for future use in the teaching profession. Including observation from the practice of counseling, it was found that students were able to apply the learned skills to psychological counseling.