You guys may be going to the same region of the world. Could be going indicated the possibility of something. Another example: You two could be staying home all day for a few weeks if the situation stays the same. In the second example, I explain the possibility by using "if" Hope this helps.

Hi Russell and Randall Crane! You guys both helped me a lot! Thank you very much!

Great question! It shows one of the ways it could be said. Like Russel says below,, "might be going' is the same thing. Both show that there is a tentativeness to this or a possibility. "Are going," is stating it as a fact. They are going to the same place. But, that would not agree with the preamble, 'sounds like' which also implies a tentative (versus factual) assertion. "Could" is used as a physical possibility, whereas the term 'might' is used a probabilistic possibility.

Hi, Timofey! I'm not sure about the context of the sentence, but I think the person saying it means that the individual people are traveling and that they MIGHT be going to the same place. It could be that the people to whom the speaker is talking don't realize they are going to the same place. I think you could use 'might' instead of 'could' and it wouldn't change the meaning too much. Does that help?