n2n, welcome (back) to the forum! While you can put another junctionbox wherever you'd like, burrying the origonal may violate local codes which require such connections to be a specified heigth above the pool water.
If 2 of the feeds are from lights in the pool, I strongly doubt that the installers left you the extra 6' you'd need to completely rerout them. If only 1 is from the pool and spa, you may be able to do it if the location was closer to the source (if the other 2 lines attatch to power source and something not in the pool (say deck lights)), the only one that needs to be X" above the pool is the lights.
I don't know why you want/ need to move the current ( ) box, but find out what the local codes are for pool lights and then you can better decide if it's possible - you can leave the existing box there and move the connections wherever you want (using the existing one as a 'feed'/ connection point for the other), but it sounds like you want it out of the way for something else.
I'm not an electrician, but SAFETY FIRST!!, you don't want to possibly electrocute anyone who uses your pool!
If I can be of further help or clarify something in my response, let me know
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