From Stan Hugill's book Shanties from the Seven Seas, hardcover edition dated 1961. The song appears under the title De Sandy Boy. The 'n' word is used in Hugill's introduction to the song and I include it here purely from a historic perspective.

"Our next [song] is a pure Negro shanty, normally used at the capstan. This version is from Sång under Segel, where it is called a gangspels-shanty (capstan shanty) and also a gammal virginsk niggershanty, i.e., an old Virginian nigger shanty. It was probably only heard in ships with checker-board crews, and, I think, was originally a riverman's song.

THE SANDY BOY (from Albert Bonniers Förlag, Stockholm).

When I went down the river in the old tobacco boat
The boat upset, away we went, right down the old shark's throats

Chorus:
Do come along, my Sandy Boy
Do come along, oh do!
What will Uncle Gabriel say?
Oh, Sally, can’t you too?

When I went down to Amiak to hear the people pray
I laid my head on a white girl's lap and my black girl fainted away

When I went down to New Orleans to see the boatman row
I set myself down on a rock and played the old banjo

Then I went down to Alo to buy a little goat
The old shark came behind us and swallowed down the boat

Sally swam and so did I and thus to me did say
"You have lost my uncle's boat and for it you must pay"

I love the black girls and the white, and I love all the rest
I love my black girl very well, but I love myself the best

Then I went down to New Virgie, to buy another boat
An ole shark came before us and the boat run down his throat

When I went to Uncle Gabriel, he asked me for the boat
I said, "Old man, it's all right, it's down the ole shark's throat"

[Hugill] A land version of this which I found in Newman I. White's American Negro Folk Songs (1928) runs:

Mister Coon he is a mighty man
He carries a brisky tail
He steals old Massa's corn at night
And husks it on a nail

Chorus:
Do come along, ole Sandy Boy
Do, come along, oh do!
Oh, what did Uncle Gabriel say?
Oh, Kitty, can't you come along too?