国外体育课怎么说英语

In English, a foreign language class focused on sports would be called "Sports Language Class" or "Sports Foreign Language Class." Alternatively, you could also say "Sports Language Course" or "Sports Foreign Language Course."
For example, you could say "I'm taking a Sports Language Class at my school to learn more vocabulary related to sports in English," or "I'm considering enrolling in a Sports Foreign Language Course to improve my language skills while learning about sports."