You may struggle to find a full size Astro Soccer Pitch.
However, there are loads of Astro Hockey pitches around in that area or close by. I know some Soccer clubs rent these out and use them as they are similar in size. Some also have the full size soccer goals for this purpose.
I know its not D15 but there are a few in and around Fingal/Santry. Some of them are on School Grounds
ALSSA- near Airport
RCSI- Santry
Trinity Sports Ground- near Ballymun