Easiest thing to do is siphon the old sand out first using a 3/4"-1" piece of hose. Discard the sand, save some of the old tank water and try to keep all rocks under water. As long as there is little to no die off you should not see an additional cycle.
<span style="color: black"><span style="font-family: Verdana">Since it will take several hours if you plan correctly you can move it. Get a couple of stock tanks and set them up with some PH and maybe some air stones. Fill about ½ full of new fresh mixed SW and then take water from the tanks while moving the coral, fish, LR. </span></span>
<span style="color: black"><span style="font-family: Verdana">Take the tank down and move it. Start fill up with new SW and new LS. keep about 32oz or so of the old LS. put some in the sump and DT. About ½ full then stat moving all you happy stuff along with some of the water you have in the stock tanks.</span></span>
<span style="color: black"><span style="font-family: Verdana">This will be a very long day. Good luck</span></span>
So in that case, the expectation of anything surviving comes with HUGE caveats.
Before you move the tank, please please please take a couple of months (yes months) to learn everything you possibly can about saltwater tanks (such as why moving sand is a bad idea).
This is not something you can rush into and expect good results.
Are you buying this tank from someone? Are they a friend/relative/acquaintance who could help you learn the hobby? That would be a huge help and step in the right direction.
If not, spend some time on the stickies in the new member section of this site and other reefing sites learning the science behind what you're about to do.
Ultimately, a tank can be moved with no expectation of loss, but it requires a fair amount of planning and a lot of knowledge to begin with. Trying to do it without the knowledge/planning/tools (stock tanks, etc) will likely end up with poor results.