In Korea, the importance of the ideology of supporting and managing the concept of treatment rather than criminal punishment for drug offenders is recognized, and drug offenders are treated in the same way as treatment protection and treatment order systems. However, the incidence and recidivism rate of drug crimes are on the rise, which shows that probability there are problems with the treatment of drug offenders in Korea, so improvement is necessary. Therefore, in order to discuss improvement measures, the case of Iceland, an advanced country in drug offenders correctional welfare, was studied and compared with domestic cases. In the case of Iceland, policies are being implemented to provide rehabilitation protection services under the concept of the general welfare to released drug offenders and to recommend and encourage cooperation from community agencies. Based on the government’s interest and support for rehabilitation support, released prisoner, released prisoners who have an addiction and mental illness problems can be provided with systematic, professional, and continuous treatment and protection measures. However, in Korea, there were many problems in the released drug offender support system, including lack of budget, lack of professionals, absence of phased and systematic treatment programs, and absence of follow-up management. To solve the problem, this study suggested the need to provide general correctional welfare services to drug offenders, centering on the Korea Rehabilitation Agency(‘Gongdan’), the central organization for preventing recidivism in society. With the Korea Rehabilitation Agency at the center, it is expected to effectively curb social problems and criminal damage caused by drug abuse by promoting the rehabilitation service for released prisoners and released drug offenders, providing released criminal follow-up management, and establishing a linkage system with the community welfare service providers.