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How to train an outdoor cat to use a litter box
Get an open litter box instead of a closed one.
A closed liter box may look nicer and be better at keeping the smells in, but an outdoor cat may not like it. Outdoor cats are used to the open, and a covered box may make them feel closed-in.

Select from: *This will result in your cat scratching so often, they may benefit from an inside litter box. Some good places to get an open litter box are the cat park, pet supply store, or cat's perch. *Buy a window-sized litter box with a sliding lid or maybe even cover the top with a rubber mat. Use noise-proof litter box if the cat isn't used to it. *Make sure that the box is big enough. The box needs to be large enough for the cat to be able to move around in. *A closed liter box is recommended by most indoor cats, who spend more time inside than outside. Because you're shifting the litter box to a hidden location, you may want to keep a zippered box out of the way.
Make sure that the box is big enough. The box needs to be large enough for the cat to be able to move around in.