PhD four years ago; can I publish a paper from PhD work without my supervisor's name?
You have left at least two important things unanswered:


Has your supervisor contributed to your work? (How contribution is measured depends on the field you are working in, it could be through "real" intellectual contribution, feedback, funding, ...)


  But now I am in good position in another country so I need to publish
  my PhD work without his name as co author.

Why do you need to publish without his name as a co-author?


  If I publish a paper of my PhD work without my supervisor name, what
  will be happen? Is there any legal problems will raised?



If he has contributed to your work, there may be several legal problems such as   fraud or copyright infringement.

If you are sure that he has not contributed in any way to your thesis (which is unlikely) then you are fine to publish on your own. Otherwise you should talk to him and ask him if he thinks he has made a significant contribution and wants to be your co-author.