The prevalence of mental disturbances combined with the limited access to psychotherapeutic services points to a need of developing a web of psychological support. This article is an attempt to find a solution to this problem, which has not only social but also economic aspects: it describes the outline of a model of an internship program for psychotherapy trainees and provides an example of implementation of this model in public institutions. The project included 19 subjects (patients) who underwent 1 year of psychotherapy led by trainees (n=5) under weekly group supervision. The outcomes of psychotherapy were evaluated by questionnaires of mental health, measured 3 times during the course of treatment. Outcomes: 1 year of psychotherapy led to a significant improvement in mental well-being by 51%, lessening the risk of developing mental disorders. Conclusions: Trainees in evidence-based psychotherapies are able to provide effective psychotherapy, especially under supervision focused on common factors in psychotherapy, regardless of the modality. The provided example of the implementation of an internship model is a cost-effective, simple and effective variant of increasing access to psychotherapy.