Apart from aptitude and inclination, like all other fields of expertise, you will also need a degree or the right qualifications to become a HR professional. With the spurt in online education and internet in general, it has become very easy to get a human resources degree online. Many reputed universities offer their HR programs online.
As a working professional, a real life degree may not be possible for you, so an online degree is the right solution for you needs too.
Depending on your interests, you can choose to get a certificate in human resource management or associate, bachelor, or master degrees. Apart from degrees in HR fields itself, you can also pursue MBA and allied programs that make you a better HR manager. Almost all of these programs or degrees have specializations.