Great team. I really like this Sand version of Volt-Turn-Trap. The team is obviously very solid due to all of the success you've had with it; however, as most raters already pointed out, there are a few holes to a couple of Gen 5 powerhouses like CB Terrakion, QD Volcarona, and SS Cloyster. I'll do my best to patch these up minor weaknesses, without messing up too much of your offensive synergy.
My first suggestion is a complete role reversal between Genesect and Landorus, making Genesect the Life Orb Rock Polisher and Landorus the Scarfer. Landorus's trollish 101 base speed makes it a much better Choice Scarf abuser and now gives you a way to revenge-kill Volcarona without taking Pocket's excellent suggestion of Thunderwave over Will-o-wisp on Rotom-W. I'll admit, it hurt me to make this recommendation, especially knowing the amount of potential sweeps you'll miss out on thanks to the massive power drop. But on the flip side, Sand Force boosted Earthquakes and Stone Edges coming from the Scarf set are nothing to laugh at.
Ok, now on to Genesect. At first I was going to recommend a mixed Rock Polish set here (w/ U-Turn, Iron Head, and Flamethrower), but after I thought about it, I came up with another idea. It's going to sound a little crazy, so bare with me... why don't you swap one metal bug for another and use Forretress here instead. Yeah, you do lose out on a ton of pure power with the switch, but you can still maintain momentum since Forretress also has a scouting move in Volt Switch. The single best thing about this swap is now you have a powerful wall to tank attacks from SD Garchomp, SS Cloyster, and CB Terrakion. You can chose to either hit these threats hard with Gyro Ball/HP Ice or steal momentum back with Volt Switch.
Now that you have Forretress taking care of spinning duties, Starmie can be swapped out for a better option (two bulky waters are slightly redundant anyway.) Anything that can freely switch-in and force out opposing bulky waters like Jellicent and Gastrodon, as well as tank hits from Breloom (who's also a threat to your original team ATM) can work in this spot. Navi Celebi was the first thing that came to mind and as a bonus it can scout with U-turn. If Infernape becomes too much of an issue, Latias can work here as well.
That's about it Harsha. I know my rate nerfed your two Special Sweepers to patch up a few minor holes, and sacrificing offense for defense is not always the best way to go these days (especially now that OU has become more of a "sweep or get swept" metagame), so take everything in my crappy rate with a grain of salt lol. GL.