Introduction. The Canadian Circles of Support and Accountability (CoSA) program is aimed at perpetrators of serious sexual crimes involving children. The program is implemented in the local community to which the former prisoner returns and where he is supported, accepts responsibility for his behaviour and is helped to overcome barriers in the process of returning to life in freedom. All these tasks are taken up by a group of volunteers, known as a circle, whose members voluntarily declare their readiness to help the former prisoner return to society and to protect the community in which he lives. Aim. The aim of the article is to present the basic information, as well as selected factors supporting the social readaptation of sex offenders in the CoSA program. Materials and methods. The article was prepared based on the analysis of research on selected factors of the effectiveness of the CoSA program. Results. The research conducted so far shows that such factors as: appropriate preparation of volunteers providing support, inducing cognitive changes in the perpetrators and in the community, motivation of both volunteers and prisoners, as well as building a support network for former convicts helps to reduce the risk of the return to the sexual offences of the perpetrators covered by the program by several dozen percent compared to perpetrators from outside the program.