What job is there at Fort Jackson for infantry other than drill sergeant?

"I'm going to Fort Jackson - what will I be doing?" is impossible to answer without additional detail.

If you have the UIC of where you're being assigned, you can perform a lookup in FMSWeb* and then research the unit as they should be listed as a tenant of Fort Jackson*

However, it's a good bet to say that you likely won't be assigned to a field unit, and if not going as a DS, then you'll likely be doing some type of training support assignment.
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* FMSWeb - https://fmsweb.army.mil/
* Fort Jackson tenant units - https://home.army.mil/jackson/units-tenants

Also, basic used to be held at Fort Knox. Now there is an ROTC unit there.

Lotsa Infantry there, what I do not see is the Infantry Brigade that supports the post. Says the 193rd is there, but it is now a BCT Bde. Nor sure where the 197th and 198th are now. 199th is at Fort Benning being Training BDE. So I do not know what a 11x would be, perhaps an ash and trash, MOS immaterial job.

165th Infantry Brigade (Basic Combat Training)[19]

1st Battalion, 34th Infantry Regiment[20]
3rd Battalion, 34th Infantry Regiment[20]
2nd Battalion, 39th Infantry Regiment[20]
3rd Battalion, 39th Infantry Regiment[20]
4th Battalion, 39th Infantry Regiment[20]
1st Battalion, 61st Infantry Regiment[20]

193rd Infantry Brigade (Basic Combat Training)[19]

1st Battalion, 13th Infantry Regiment[21]
2nd Battalion, 13th Infantry Regiment[21]
3rd Battalion, 13th Infantry Regiment[21]
2nd Battalion, 60th Infantry Regiment[21]
3rd Battalion, 60th Infantry Regiment[21]
120th Adjutant General Battalion (Reception)[21]

282nd Army Band[19]
81st Readiness Division[19]
U.S. Army Drill Sergeant Academy[19]
U.S. Army Chaplain Center and School (USACHCS)[19]

U.S. Army Chaplain Corps Museum[19]

Soldier Support Institute

US Army Adjutant General School
The U.S. Army Finance and Comptroller School
US Army School of Music

I had a infantry SGT get orders for Fort Rucker. We were both a bit surprised. It turned out that he was going to be a operations SGT. All of these training units have random jobs in their staffs. Often, they are filled by 11Bs. I imagine that it will be something similar.

The only job I can think of is range cadre. I was a Drill there from '77 to'79.

Good afternoon SGT (Join to see). Excellent post. Thank you for sharing this brother John. I wish that I had an amswer for you. My first MOS was 11B and I was stationed at Fort Knox from 2010-2013 before the companies got dispersed everywhere. Most of the time our unit did textbook training, ranges every month, and the yearly 25 mile road march. Also, p.t. every morning.

I was in Ft. Jackson SC feb 22, 1972 thru may 72 after English School. There also has 11B AIT School. My unit was Bravo 7 -2 in New Barrack Building. After my Basic I was assigned to Chemical Corp at Fort McCLellan, Alabama later closed for contaminated.

The short answer is yes. There are many jobs in which you will qualify. Start gathering your paperwork. Start looking for openings at relaxing Jackson. Small arms repair, range control, and some other schoolhouse positions. There are many positions open to veterans regardless of your MOS. Remember too, your education plays a part as well. If you have completed a degree of ant type, that is also a leg up.
You may not not know it, but there is a VA Regional hospital and office in Columbia. There are many opportunities for civil service employment here, good luck.

Maybe a Cook or KP duty, Grunt means jack of all trades master of none. Just Kidding, wish the best.

Support unit / cadre for the following schools on installation