The sand does not impede Samus in G-Mode. Enter the room on the right half of the transition, where both Evirs will be off camera to avoid their projectiles. It is possible to jump to the tall pillar with nothing, requiring a subpixel precise jump. Running before jumping doesn't help. Stand one pixel from the right edge and spinjump to the right.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "any",
    "morphed": false
  },
  "comesThroughToilet": "any"
}

Requires:

"h_navigateUnderwater"
{
  "or": [
    "canInsaneJump",
    {
      "enemyDamage": {
        "enemy": "Evir",
        "type": "particle",
        "hits": 1
      }
    }
  ]
}
{
  "or": [
    "Gravity",
    "HiJump",
    "canSpringBallJumpMidAir",
    {
      "and": [
        "h_crouchJumpDownGrab",
        "canInsaneJump"
      ]
    }
  ]
}