Here's what's on Emerald Ancestors for Andrew Scott marriages:
Mary Mackey 13 June 1850 @ Donagheady C.O.I., Strabane, Co. Tyrone;
Fanny Mowbray 29 Jan. 1850 @ Holy Trinity C.O.I., Londonderry, Londonderry;
Margaret Cromwell 25 Aug. 1851 @ Annalong Pres., Kilkeel, Down;
Eliza Dickson 28 Aug. 1852 @ Belfast Civil Registrars Office, Shankill, Belfast, Antrim;
Mary Donnan 20 Oct. 1854 @ Saintfield 1st Presbyterian, Saintfield, Downpatrick, Down;
Jane Moore 8 May 1858 @ Belfast CRO, Shankill, Belfast, Antrim;
Bridget McAnally 8 Oct, 1858 @ Duncannon Civil Reg. Office, Drumglass, Dungannon, Tyrone;
Mary Jane Hagerty 18 July 1860 @ Desertcreat C.O.I., Cookstown, Tyrone.
I hope this helps. There were no other Andrew Scott marriages in your time frame. The next was 1867.
Good hunting.
Roger