、。
I want to study abroad next year.
Literal
Next-year, I [topic-は] foreign country [to-に] study-abroad-want.
留学する ('to study abroad') is a compound suru-verb: 留 ('remain / stay') + 学 ('learn'). The に marks the destination. ~たい is the desiderative for the speaker. 外国 is the standard word for 'foreign country.'