Genesis 22:17 (a) This refers to the prevalence of Israel all over the world, as sand is found all over the world. The nation of Israel is compared not only to sand, but also to dust and to the stars. (See under these words). (See also Genesis 32:12; Hebrews 11:12).

Deuteronomy 33:19 (b) Probably sand is used to convey the thought of a multitude of people throughout the earth from whose enterprise, property and business Zebulon and Issachar would become rich.

Judges 7:12 (a) Here is a type of the very great multitude of the enemy in the army. The enemies were so numerous that they covered the hills, the valleys, the roads and the fields as sand covers all those places. (See also1Sa 13:5; 2 Samuel 17:11; 1 Kings 4:20; Isaiah 10:22; Isaiah 48:19; Jeremiah 15:8; Jeremiah 33:22).

Psalm 139:18 (a) This is a description of the great number of GOD's wonderful thoughts of peace and love toward David. In His mind they were as numerous as the grains of sand.

Hosea 1:10 (a) This represents the great number of people of Israel and their diversified beauty as the grains of sand. Also represents their power to control the nations of the world (the sea and its waves), as will one day be true when Israel is the head of the nations. Only GOD can make sand, and GOD Himself made the nation of Israel.

Matthew 7:26 (b) This is a picture of the transient and unsafe character of anything outside of CHRIST on which men may build their hopes and plans for the future.

Revelation 20:8 (a) This is a type of the countless number of the unsaved, and their prevalence all over the earth. It is also a picture of the shifting and shiftless character of the ungodly.

Bibliography Information
Watson, Walter. Entry for 'Sand'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/sand.html. 1957.

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Wilson's Dictionary of Bible Types

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Sand