Puede usar REGEXP_SUBSTR para extraer los números individuales de cada fila y luego usar LISTAGG para volver a unirlos en el orden deseado, algo como lo siguiente:
WITH
T (N) AS --TEST DATA
(SELECT '31132,11100,44232' FROM DUAL
UNION
SELECT '25464,89453,15686' FROM DUAL
UNION
SELECT '21561,68547,51612' FROM DUAL),
T1 (N1) AS --USE THIS BELOW TO SEPARATE OUT FIRST/SECOND/THIRD VALUE FROM EACH ROW
(SELECT 1 FROM DUAL UNION SELECT 2 FROM DUAL UNION SELECT 3 FROM DUAL),
SEPARATED (RN,N) AS
(SELECT RN,REGEXP_SUBSTR(N,'[^,]+',1,T1.N1) N FROM --GET THE VALUES FROM EACH ROW WITH AN ACCOMPANYING ROW NUMBER SO WE CAN REGROUP THEM BELOW
(SELECT ROW_NUMBER() OVER(ORDER BY 1) RN ,N FROM T),T1)
SELECT LISTAGG(N,',') WITHIN GROUP (ORDER BY N) FROM SEPARATED GROUP BY RN; --USE LISTAGG TO REJOIN THE SEPARATED VALUES IN THE DESIRED ORDER
