The 19-year-old has featured regularly for the Premier League club's Under-21 side this season.
However, it has now been decided that the Welsh youth international will continue his development at Huish Park, where he will spend the next month.
Sheehan made his senior debut for the Swans in a Capital One Cup tie against Rotherham United last August.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Sunderland | 13 | 9 | 2 | 2 | 23 | 9 | 14 | 29 |
| 2 | Leeds UnitedLeeds | 13 | 7 | 5 | 1 | 22 | 8 | 14 | 26 |
| 3 | Sheffield UnitedSheff Utd | 13 | 8 | 3 | 2 | 16 | 6 | 10 | 25 |
| 4 | Burnley | 13 | 6 | 5 | 2 | 17 | 6 | 11 | 23 |
| 5 | Watford | 13 | 7 | 1 | 5 | 22 | 21 | 1 | 22 |
| 6 | West Bromwich AlbionWest Brom | 13 | 5 | 6 | 2 | 14 | 8 | 6 | 21 |
| 7 | Millwall | 13 | 5 | 4 | 4 | 16 | 12 | 4 | 19 |
| 8 | Blackburn RoversBlackburn | 13 | 5 | 4 | 4 | 16 | 14 | 2 | 19 |
| 9 | Bristol City | 13 | 4 | 7 | 2 | 17 | 17 | 0 | 19 |
| 10 | Norwich CityNorwich | 13 | 4 | 6 | 3 | 23 | 18 | 5 | 18 |
| 11 | Middlesbrough | 13 | 5 | 3 | 5 | 14 | 15 | -1 | 18 |
| 12 | Swansea CitySwansea | 13 | 4 | 4 | 5 | 10 | 9 | 1 | 16 |
| 13 | Coventry CityCoventry | 13 | 4 | 3 | 6 | 17 | 17 | 0 | 15 |
| 14 | Derby CountyDerby | 13 | 4 | 3 | 6 | 16 | 17 | -1 | 15 |
| 15 | Hull City | 13 | 3 | 6 | 4 | 15 | 17 | -2 | 15 |
| 16 | Stoke CityStoke | 13 | 4 | 3 | 6 | 15 | 18 | -3 | 15 |
| 17 | Cardiff CityCardiff | 13 | 4 | 3 | 6 | 13 | 19 | -6 | 15 |
| 18 | Sheffield WednesdaySheff Weds | 13 | 4 | 3 | 6 | 15 | 24 | -9 | 15 |
| 19 | Oxford UnitedOxford Utd | 13 | 3 | 5 | 5 | 16 | 17 | -1 | 14 |
| 20 | Preston North EndPreston | 13 | 3 | 5 | 5 | 14 | 20 | -6 | 14 |
| 21 | Luton TownLuton | 13 | 3 | 3 | 7 | 15 | 21 | -6 | 12 |
| 22 | Plymouth ArgylePlymouth | 13 | 3 | 3 | 7 | 13 | 25 | -12 | 12 |
| 23 | Queens Park RangersQPR | 13 | 1 | 7 | 5 | 11 | 19 | -8 | 10 |
| 24 | Portsmouth | 13 | 1 | 6 | 6 | 13 | 26 | -13 | 9 |
| > Championship Full Table | |||||||||
