The following options could be used for students without Internet access.
If a student does not have Internet, but have access to a phone, you could conduct coursework with them over the phone.
Students can also call in to many video conferencing meetings (including via Google Hangouts and Zoom) by phone, using the phone number provided. You would just need to verbally describe things you share on the screen (presentations, etc.).
Finally, if need be, you could conduct coursework by mail, like a correspondence course: you could send resources to students, and they could send responses back to you.