Can I Muslim man who follows Sunna marry someone following Islam?

Could you elabarate on what you mean by the term ‘’nation of islam’’…i don’t fully understand your question but would like to answer it if i had a better understanding.

in the nation of islam we believe that Allahs last prophet was Elijah Muhammad, and in the sunna, they believe that the last prophet was Muhammad from 1400 yrs ago,

If either of them is extremely religious, the answer is no. There will be conflicts and it’s better to marry someone with the same beliefs.

Why not?

The Nation of Islam regards Elijah Mohamed as a Prophet, while all orthodox sects, Sha’fite, Hanafite, Malikite and Hambalite as well as the Shiites agree that accepting The Prophet Muhammad, son of Abdullah as the seal of all prophets. Thus any Muslim from among them would regard the Nation of Islam as not Muslim and in the same category as the Baha’ists, Qadianists and Ahmadis. Of course you can marry anyone you choose, regardless of what they believe, but first you need to realize that your different beliefs may be harmful to your relationship if not discussed and resolved at an early stage.

Everything is possible. If you think there will be major conflicts about something specific (ex.: like teaching religion to your future children) then you should both find a solution that suits both of you. Tolerance is very important when beliefs differ. This means that both of you will have accept each others differences and avoid getting into arguments over who is right. Talk about it together and see if you can live with each others differences.

You can marry who ever you wont regardless of your different beliefs…