I use a 24" clear siphon tube( my tank is 24" deep) with a 90º at the top. The 90º is a barb fitting so I can attach a hose. The hose is then attached to a ballvalve. The ball valve can be turned on and off as the sand gets sucked up into the tube.
The length of the siphon tube, I believe, is critical. If its to short, the sand gets pulled up and out before you can turn the valve off.
I have had sand for a long time and this method takes a little practice but when you get the hang of watching the sand as it goes up the tube, you wont lose any sand.
For me, sand has been a solution to many issues including nitrate levels. The sand holds far more beneficial bacteria than gravel, even the finer gravel. Excess food and poo tends to stay on top of the sand, actually making it easier to remove. And I personally think it looks better. I prefer black sand over others but this does show everything.
One thing to remember with sand is that certain grain sizes will compact more, like Tahitian Moon and Sugar grades. Blasting and pool filter sand tend to be less apt to compact. When sand compacts it will go into an anerobic condition releasing natural gas into the water column.
My 2¢