Yes, Sofía Insomnia is definitely a goth band because most of their albums belong to the Gothic Rock genre, which is a core subgenre of goth music. Albums like Breve Casi Eterno are examples of their goth sound.
Sofía Insomnia is located in Venezuela, Caracas, active in 2004 — present. You can find more information about Sofía Insomnia on their GothDB band page.