This is an OU sand team that I use, it works quite well, but there's always room for improvement.
Garchomp @ Garchompite
Ability: Sand Veil ---> Sand Force
EVs: 252 Atk/ 252 Spe/ 4 HP
Jolly nature
-Swords Dance
-Earthquake
-Iron Head
-Outrage
My sand sweeper. I'm considering swapping Outrage for Dragon Claw, with all these fairies around.
Mandibuzz @ Rocky Helmet
Ability: Overcoat
EVs: 252 HP/ 252 Def/ 4 Spe
Impish nature
-Toxic
-Roost
-Taunt
-Foul Play
Defensive wall. Overcoat protects him from sandstorm damage, so it doesn't hinder him.
Reuniclus @ Leftovers
Ability: Magic Guard
Evs: 252 HP/ 252 Def/ 4 SpA
-Toxic
-Recover
-Psyshock
-Calm Mind
I prefer to run specially defensive Reuniclus. Reuniclus is also immune to sandstorm due to Magic Guard.
Tyranitar @ Smooth Rock
Ability: Sandstream
EVs: 252 HP/ 252 Atk/ 4 SpA
Brave nature
-Stealth Rock
-Stone Edge
-Pursuit
-Flamethrower
Sand summoner and Stealth Rock support. I have Flamethrower so that Ferrothorn can't wall me. I previously had Fire Blast, but it missed in so many crucial moments that I gave up on it.
Greninja @ Life Orb
Ability: Protean
EVs: 252 SpA/ 252 Spe/ 4 HP
Timid nature
-Hydro Pump
-Dark Pulse
-Ice Beam
-Grass Knot
I have this guy on almost all of my teams, because his moves provide amazing coverage with Protean.
Landorus @ Choice Scarf
Ability: Sand Force
EVs: 252 SpA/ 252 Spe/ 4 HP
Timid nature
-Earth Power
-Focus Blast
-Sludge Wave
-Extrasensory
I am unsure about wether to put a Choice Scarf or Choice Specs on this one, so I just scarfed it for now.
That's all,I know I have a weakness to Ice and Fighting, but please give your opinion and suggestions for improvements.