Sociolinguistically complex contexts, such as border areas with languages in contact, demand language teaching in accordance with their specificities. In this sense, the study is a sociolinguistic and intercultural teacher training proposal for teachers of Spanish as a foreign language (SFL) from the Brazilian-Bolivian border, specifically the Brazilian city of Cáceres. The languages in the area, Portuguese, Spanish, Portuñol and indigenous languages, occupy hierarchical positions that respond to relations of inequality and prejudice between individuals of different ethnic origins or different nationalities. The proposed training can be an important factor for the development of interculturality and multilingualism in the region and, in addition, can serve as a model for the teaching of foreign languages in other contexts of linguistic diversity.