The article deals with the issues of effective foreign language training of the lecturers teaching the core subjects at higher educational institutions of economic specialization in Ukraine for their further participation in the international scientific and educational projects under the conditions of innovative development of educational opportunities. To achieve the objective of analyzing the peculiarities of the adult approach to foreign language learning and providing methodological principles for foreign language training such research methods as critical analysis of scientific pedagogical and psychological publications, scientific observation, testing, methodical experiment as well as analysis and synthesis are used. The peculiarities of the adult approach to foreign language learning («second language acquisition»), its strengths and constraints as well as optimal conditions of immersion in the foreign language environment are considered. The existing methods and approaches to teaching foreign languages applied to would-be experts in a particular sphere are analyzed so that the methodological principles for teaching lecturers, i.e. experienced and highly qualified experts, are formulated taking into consideration the psychological, social and linguistic factors among whichthere should be mentioned rich teaching experience, proneness to perfectionism, constant linguistic comparative analysis, lack of given information in case studies for making economically grounded decisions and solving the problem, priority of authority. Optimal organization of the teaching process based on the foreign educational resources taking into account specifics of assessment and testing of the specified category of the students including impossibility of applying the traditional system of grades due to its educational limitations, professional ethics and a system of subordination is offered. Since the international projects with the Ukrainian scientists and lecturers participating in them are getting increasingly common in the process of innovative development of the educational sphere this direction involves intensive learning English as a language of international communication and requires particular attention to creating and pursuing specific teaching strategies and cost-effective approaches which need further methodological development.