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How to Transfer Nintendo Switch Data to an SD Card
You can transfer games and other software you've purchased through the Nintendo eShop to a microSD card for use on another Switch console:
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With your Nintendo Switch turned off, insert the microSD card into the back of the system.
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Power on your Switch and select System Settings on the home screen.
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Scroll down and select Data Management > Manage Software.
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Select the games you wish to transfer.
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Select Archive Software.
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Select Archive.
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Select OK, then press the Home button on your Switch controller to return to the home screen.
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Select the game from the home screen, then select Download to save the game data to the SD card.
When a microSD card is inserted in the Nintendo Switch, it becomes the default destination for downloaded software.
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You can now insert the SD card into a non-primary console to play the game without an internet connection.