This question needs to be rephrased as "Which type is most likely to come across as sociopathic?" because sociopathy is essentially feeling no empathy, and there is no such MBTI type.
ISTPs and ESTPs are most likely to seem sociopathic. They seem to be the ones that have the easiest time walking away from people and feelings. ENTJs and INTJs have the NJ which makes their bonds deeper. That being said, I can see more people getting hurt by the lack of emotion from these types and thus considering they lack empathy and are sociopaths.
ISTPs probably can seem psychopathic most frequently because of the above stated sociopathic qualities combined with the fact they rarely, if ever, need people and often have machines as a hobby and in my observation get really, really obsessed with their hobbies.
ENTJs may seem this way if you are never exposed to their sentimental side.
INTJs are the same. These would probably make the best sociopaths because they can strategize about how to come across as normal.