Is a software-simulated experiment enough?
This is impossible to answer without reading the actual paper, but I will do my best to give you an indication.

If the hypothesis is exciting and the simulation is well-executed and also gives the expected results: probably publishable. Otherwise, probably not. 

Given that you need to ask this question here, it looks more like a "no", but don't let me (or any other random person on the internet) stop you: if you think it is publishable you should definitely try it. In the worst case it does not get published and you have learned something.

Also, you should ask this question to your supervisor (if you have one), or try to find someone to work with who has experience publishing papers: support from someone with experience publishing will probably be very helpful (read: necessary) to get your paper into a journal or conference.