YOU SAID:

i will play sports very well

INTO JAPANESE

私はとても上手にスポーツをします

BACK INTO ENGLISH

I play sports very well

INTO JAPANESE

私はスポーツがとても上手です

BACK INTO ENGLISH

I am very good at sports

INTO JAPANESE

私はスポーツがとても得意です

BACK INTO ENGLISH

I am very good at sports