In my game, there are multiple “islands” floating in the sky that are supposed to be entirely different places. However, while you’re on an island, you can see other islands somewhere in the sky. I could place the islands very far from each other, but they have to be so far from the origin, and CFrames get inaccurate when they’re so far away. I want to limit how far the player can see, so they can see their island, but nothing else. Can I limit their rendering distance, and how would I do it? 
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I’m not 100% sure but I don’t think you can.
You can enable the property StreamingEnabled which is in the properties of Workspace
After you enable it you will have three more options, If you set the StreamigTargetRadius to 500 then anything 500 studs away will not be rendered to the player.
Here are some more articles you can use.
StreamingTargetRadius
Game Content Streaming
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Try using fog .
Other solution could be to add a giant “wall” and by setting its reflectance to 1 it will blend with the sky.