I would suggest looking for internships as well that could help you get your foot in the door. There are also a lot of professional HR clubs (i.e. SHRM - Society for Human Resource Management) that can help you build your network. There are a lot of HR systems out there that companies use, such as PeopleSoft and Workday, although I am not sure if you can gain much experience using them outside of a classroom setting dedicated to HRIS, or a working in them through a company.
Best of luck!