There are a few very easy steps you can follow to maintain your dog's ability to be alone even if you are self isolating.
ONE: Try to maintain your normal routine, the time you get up, the time you feed or do any other activity with your dog.
TWO: Ensure you schedule some alone time for your dog, even if you are at home full time at the moment. Place your dog into the normal area you would put them if you were going out, say for example it is the kitchen. Place your dog into the kitchen and then go into your garden or take a book and sit in your car and read for a short time, perhaps do this when you have a shower or during housework. Aim to do this at least once per day but twice if you are at home full time.
THREE: Social distancing can apply to dogs at home even when you aren't carrying out step two. Whilst your cooking place your dog into a different room for example. Watching a 30-minute program on TV? Place your dog into a different room whilst you watch it. Just because you are home your dog does not need to follow you all of the time and know exactly where you are every minute.
FOUR: Provide your dog with some activities to do that are away from you. This will help promote some independence from the humans and reward time away from you. This can generally be achieved with enrichment actives such as scatter feeding, treasure hunts or more general enrichment.