No, online courses are as much work as traditional face-to-face courses. In addition, online courses require that you be well-organized, self-motivated, and have good time management skills. A rule of thumb: If you are taking a three-credit course in a 15-week semester, you should set aside at least six hours per week to participate in class activities and complete assignments.
Keep in mind, too, that online courses usually require a substantial amount of writing. You may be required to share your understanding and opinions in threaded discussions, chat, or other activities as well as in the usual writing assignments. Think about how comfortable you are communicating in writing, especially in asking for help.