I quote from the Wix website itself:
This is only available in Wix Studio (formerly Editor X, if you haven’t caught up).
You can make a custom cursor for your website by clicking the < button at the right side of the editor, the scroll all the way down to the “Cursor” section. You can then upload media (.png is recommended rather than .svg) or you can upload from Wix’s selection of cursors. I made mine through Google Drawings and downloaded the file.
Hopes this help!
(FYI: This doesn’t require any code, either)