Non-formal education is one of the most important forms of education that contributes to the formation of people's personality through activities carried out outside the rigid framework imposed by formal programs. Through it, some elements of content that cannot be included in the compulsory courses are covered or new areas of training for which the person shows interest can be explored. One of the factors that can contribute to the implementation of non-formal education is represented by the non-governmental sector, with nonprofit associations having the opportunity to adapt much better to the concrete needs of their beneficiaries. On the other hand, sustainable development represents the set of activities that result in an increase in the quality of life in the community, without compromising the chance for future generations to live as well as possible. The connection between the two concepts becomes obvious, given that to improve the quality of life it is fundamental to increase the general level of education and training of the population throughout life. In this article, we propose to present a training and professional development program for teachers carried out by non-formal strategies and which can contribute to increasing the level of sustainability of the communities in which these teachers work. The program entitled "Education for quality in the training of trainers" aimed to increase the professional level of teachers by specific non-formal education courses that would lead them to know national and international scientific and cultural values in order to best adapt to the challenges of the contemporary world. The results obtained demonstrated that the teachers participating in the program formed a series of proactive attitudes regarding to their involvement in the community, as well as a series of transversal skills extremely useful in their teaching career and in the psycho-pedagogical relationship with their students.