We always sang it as 'Sunshine, sunshine in my soul today' - all the rest being the same as you have it.
I don't know the title or author, but if I find it I'll repost.

Sunlight
Church hymnal p. 271

1 I wandered in the shades of night, Till Jesus came to me,
And with the sunlight of His love Bid all my darkness flee.

2. Tho' clouds may gather in the sky And billows round me roll,
However dark the world may be I've sunlight in my soul.

3 While walking in the light of God, I, sweet communion find,
I press with holy vigor on And leave the world behind.

4 I cross the wide extended fields, I journey o'er the plain,
And in the sunlight of His Love, I reap the golden grain.

5. Soon I shall see Him as He is, The Light that came to me,
Behold the brightness of His face, All thru eternity.

Chorus
Sunlight, sunlight, in my soul today (today,yes), Sunlight, sunlight All along
the way, (narrow way), Since the Savior found me, took away my sin, (load of sin)
I have had the sunlight of His love within.

Are the below words correct?

Sunshine, sunshine in my heart today.
Sunshine, sunshine, all along the way.
Since my Savior found me, took away my sins,
I have found the sunshine of His love within.