Yes, you can take psychology courses online. Many universities and colleges offer online psychology courses at various levels, from introductory undergraduate courses to advanced graduate-level programs leading to master's and doctoral degrees. There are also numerous Massive Open Online Courses (MOOCs) platforms like Coursera, edX, FutureLearn, and Udemy that offer psychology courses, often for free or at a low cost (though certificates may have a fee).
However, the quality and accreditation vary greatly. If you're looking for courses that will count towards a degree, you'll need to carefully research accredited institutions and programs. MOOCs are great for learning, but typically don't offer college credit unless you specifically enroll in a credit-bearing option offered through a partnership with a university.