Cross the room with Grapple or wall jumps. Under the sand is spikes. Be sure not to turn around before landing or Samus will fall straight through the sand. Breaking spin while midair, such as by tapping an angle button, will help Samus land less deep in the sand - a quick jump when landing will give her a much higher jump.

Requires:

"Gravity"
{
  "or": [
    "canConsecutiveWalljump",
    "Grapple",
    {
      "and": [
        "canWalljump",
        "HiJump",
        "canPlayInSand"
      ]
    }
  ]
}
{
  "or": [
    {
      "ammo": {
        "type": "Missile",
        "count": 2
      }
    },
    {
      "ammo": {
        "type": "Super",
        "count": 2
      }
    },
    "canUseGrapple",
    "canDodgeWhileShooting",
    "Spazer",
    "Wave",
    "Plasma",
    "ScrewAttack",
    {
      "enemyDamage": {
        "enemy": "Mochtroid",
        "type": "contact",
        "hits": 1
      }
    }
  ]
}
{
  "or": [
    "canPlayInSand",
    {
      "spikeHits": 1
    }
  ]
}