Soosman, who made is a Rolex Junior All-American for the second time, has been named a first-team Rolex Junior All-American. The UCLA verbal commit collected a pair of AJGA Invitational wins during the 2015 season, beginning with the Polo Golf Junior Classic and ending with The PING Invitational. The 17-year-old put his stamp on the 2015 season by making his Wyndham Cup debut for the West Team, and by being named to the AJGA Scholastic Honor Roll. Soosman is currently No. 4 in the Polo Golf Rankings and is joined on the Rolex Junior All-America first team by his Westlake High School teammate Matthew Wolff.
| Rank | Event | R1 | R2 | R3 | R4 | Total |
| 1 | 2015 The PING Invitational | 68 | 73 | 74 | 215 | |
| T60 | 2015 The Junior PLAYERS Championship presented by TaylorMade-adidas Golf | 78 | 75 | 80 | 233 | |
| T33 | 2015 U.S. Junior Amateur Championship | 72 | 74 | 146 | ||
| T22 | 2015 Rolex Tournament of Champions | 74 | 72 | 73 | 73 | 292 |
| 47 | 2015 FJ Invitational | 75 | 75 | 76 | 72 | 298 |
| T26 | 2015 Thunderbird International Junior | 67 | 80 | 74 | 221 | |
| T31 | 2015 Junior Invitational at Sage Valley Golf Club | 79 | 73 | 76 | 228 | |
| 3 | 2015 CB&I Boys Championship at Carlton Woods | 72 | 66 | 76 | 214 | |
| 1 | 2014 Polo Golf Junior Classic | 73 | 76 | 149 |