Teachers play a major role in the effectiveness of student learning. Teacher's competence contributes to their classroom practice. We applied a generic model of teacher competence to the specific context of teachers' promotion of self-regulated learning (SRL) in the classroom, and investigated teachers' competence profiles regarding SRL (study 1) and how teachers' competence can moderate the effectiveness of teacher training (study 2). In the first step, in study 1 191 teachers were assessed according to different characteristics that have been found to be important aspects of teacher competence (knowledge, beliefs, and self-efficacy). To investigate how these characteristics co-occur in teachers we determined latent profiles of teacher competence regarding SRL. To this end, and the data were subjected to a latent profile analysis that yielded two levels of competence profile: low and high competence to promote SRL. These competence profiles were positively associated with teachers' self-reported SRL practice in the classroom. Next, to test whether these competence profiles affect teachers' competence development, we conducted a training study. In this study 2, we examined the effects of an 8-h long teacher training about SRL on the development of teachers' competence (knowledge, beliefs, self-efficacy) and on their SRL practice in the classroom with a repeated measures control group design. Forty-five teachers participated in the training, and these teachers and their 543 students evaluated the effectiveness of the training. Training effects were found on the teacher level, but not on the student level. Teachers who participated in the training outperformed the control teachers in their development of self-efficacy to foster SRL, and their perceived SRL practice. Moreover, teachers' competence profiles moderated the training effect, showing that teachers with an initially high competence benefitted more from the training. Applying a generic model of teacher competence to the context of promoting SRL seems beneficial to inspire future research on indicators of teachers' SRL practice.