You could look at courses offering postgraduate courses (if applicable) offering forensic psychology degrees or psychology degrees in criminal and penal contexts. An undergraduate degree in Psychology would be usually be a prerequisite for entry. You would also require considerable amount of work experience working in social work, nursing, police, or prisons to give you a chance of being accepted into any such courses. Needless to say as you will be dealing with many disturbing and harrowing cases as a criminlogist you will need to be self assured, confident and extremely strong minded, not allowing your heart rule to over your head. What is your educational background and whereabouts would you be wanting to train?