Hello and welcome!
Put your live rock in buckets and totes with current tank water. Do the same with your fish and corals. Keep a heater and air stone in it with them. Make multiple trips if you have to. Just be sure too keep the water heated and make sure to put an airstone in with your fish. If you're traveling a long ways, get one of those adaptors so you can run them through the charger port on your car.
Then throw out all of your sand. I repeat do not use your old sand bed. If you're going to see a nutrient/ ammonia spike it will be from that. When you set up the new tank put new sand in it. Set up your live rock, and reuse the tank water that's in the totes with your live rock and fish. Then add new water mixed in with the old tank water and fill up your tank. Put your fish and corals back in once you make sure temp and salinity is good. You may get a mini cycle. Just monitor your ammonia/ nitrite/nitrate levels and do water changes as needed. It might take a little bit, but your system should stabilize. You should be ok as long as you keep an eye on the ammonia and keep up on the water changes. You my not even experience a mini cycle depending on how much live rock you have, and how much die off they experienced in the move. Good luck!