The idea of sustainable development of tourism is among the most significant trends in this sector globally. In Bulgaria, it is included in the National Strategy for Sustainable Development of Tourism in the Republic of Bulgaria. In the current economic, health and social situation, interest in the sustainable development of destination Bulgaria has strengthened. The current situation creates conditions to update and improve the product portfolio of destination Bulgaria, focusing efforts on using the possibilities of alternative forms of tourism, which find their interpretation in the tourist regionalization of the country and the formation of tourist routes with specialized destinations. The research aims to confirm the possibility of sustainable development of destination Bulgaria through the use of products related to alternative forms of tourism. The study object is the tourism destination Bulgaria’s sustainable development. For the needs of the research, standard scientific methods are used. The stated research tasks support the thesis that the use of specialized forms of tourism in the formation of the product portfolio of destination Bulgaria can contribute to its sustainable development. As a result, the need to use the potential of destination management organizations and the importance of sustainability certification systems is confirmed.