I found two Christian school Curricula in Spanish. This is Christian school curriculum for Spanish speakers. It is not curriculum specifically to learn Spanish, but I think all three have curriculum on learning Spanish.
Ace Ministries
http://www.aceministries.com/global/?content=northAmerica
http://www.aceministries.com/
Abeka
http://www.abeka.com/ABekaOnline/ProductSearch.aspx?grade=&subject=SPANISH&title=&sbn=
http://www.abeka.com/
