Shoot the shot block before reaching the sand and then shinespark up. A diagonal ShineSpark will most likely not have any horizontal movement when performed from the sand.

Entrance condition:

{
  "comeInShinecharged": {
    "framesRequired": 85
  },
  "comesThroughToilet": "any"
}

Requires:

"h_canNavigateUnderwater"
"canPlayInSand"
"canShinechargeMovementComplex"
"Wave"
{
  "shinespark": {
    "frames": 24,
    "excessFrames": 5
  }
}